My company sent me a notice letter termination and...

We would like to inform you that the matter is related to the work contract, whether it is limited or unlimited, and therefore work can be terminated according to the legal principles so that it can leave the country after canceling the visa by the employer, as the law stipulates the termination in the following legal articles
Article (113):
The employment contract ends in any of the following cases:
1. If the two parties agree to terminate it, provided that the consent of the worker is in writing.
2. If the period specified in the contract expires unless it has been explicitly or implicitly extended in accordance with the provisions of this law.
3. Based on the will of one of the parties in contracts of indefinite duration, provided that they abide by the provisions of this law relating to warning and the acceptable reasons for terminating the contract without arbitrariness.
Article 115
Where an employment contract is for a definite term and the employer revokes it for reasons other than those specified in Article (120) he shall be required to compensate the worker for any damage the latter sustains, provided that the amount of compensation shall in no case exceed the aggregate wage due for a period of three months or the remaining period of the contract, whichever is shorter, unless otherwise stipulated in the contract.
The law also provided legal protection for wages in the text of Article (56) which stipulated:
Article (56)
Workers who are hired at an annual or monthly wage are paid at least once a month and all other workers are paid at least once every two weeks. Thus, if there is a violation in the employment contract, he may go to the Ministry of Labor and file a complaint and then leave the work according to
Article (121):
A worker may leave work without notice in one of the following cases:
1- If the employer violates his obligations before the worker in the articles stipulated in the contract or the law.
2- If the employer or his legal representative signs an assault on the worker.
Article 117
1. Either the employer or the worker may terminate an indefinite term contract for a valid reason at any time following its conclusion, by giving the other party a notice in writing at least 30 days prior to termination.
2. For the daily-paid workers, the notice period shall be as follows:
• One week: if the worker has been employed for more than six months but less than one year.
• Two weeks: if the worker has been employed for not less than one
year.
• One month: if the worker has been employed for not less than five
years.
Article 118
A contract shall subsist throughout the notice period referred to in the preceding Article and shall terminate only on expiry of that period. The worker shall be entitled in respect of the notice period to full pay, calculated on the basis of his last wage, and shall continue to perform his duties during that period if the employer so requests. The Parties may not agree to waive the notice requirement or to reduce the notice period; however, they may agree to extend the period.
Article 119
If either the employer or the worker reduces the period of, or fails to serve a notice of termination on the other, the forbearing party shall pay the other a “compensation in lieu of notice”, irrespective of whether or not the other party has sustained damage as
a result of such failure or shorter notice. The said compensation shall be equal to the worker's wage in respect of the entire or reduced period of notice. Compensation in lieu of notice shall be calculated on the basis of the last wage received, in the case of
monthly, weekly, daily and hourly paid workers, and on the basis of the average daily wage referred to in Article 57 of this Law in the case of those paid on piecemeal.
Note that after resignation and accepting it that requires NOC and cancelling the visa by the sponsor or any other representative.
Provide legal protection for wages, especially since the Labor Law stipulated in Article (56)
Article (56)
Workers who are hired at an annual or monthly wage are paid at least once a month and all other workers are paid at least once every two weeks. Thus, if there is a violation in the employment contract, he may go to the Ministry of Labor and file a complaint and then leave the work according to
Article (121):
A worker may leave work without notice in one of the following cases:
1- If the employer violates his obligations before the worker in the articles stipulated in the contract or the law.
2- If the employer or his legal representative signs an assault on the worker.
** Therefore, you can go to the workplace and file a complaint
** In addition to the fact that with the validity of the work contract, it cannot be terminated, otherwise the matter is considered an arbitrary chapter that requires the employer to pay compensation to the worker, even if the change is under the pretext of changing the contract this matter is against the law, and an end-of-service bonus can be claimed before signing any new contract. This is a right guaranteed by law, and the bonus is calculated according to the law as follows:
Article (132):
A worker who has completed one or more years of continuous service shall be entitled to severance pay at the end of his employment. The days of absence from work without pay shall not be included in calculating the period of service. The severance pay shall be calculated as follows: 1. 21 days' wage for each of the first five years of service. 2. 30 days’ wage for each additional year of service provided always that the aggregate amount of severance pay should not exceed two year's wage.
Article (133):
A worker shall be entitled to severance pay for any fraction of a year he actually served, provided that he has completed one year of continuous service.
Article (134):
Without prejudice to the provisions of laws that grant pensions or retirement benefits to employees in certain firms, severance pay shall be calculated on the basis of the wage last due for monthly, weekly and daily paid workers, and on the basis of the average daily wage referred to in Article 57 hereof for those paid on piecemeal. The wage used as a basis for calculating severance pay shall not include whatever is given to the worker in kind, housing allowance, transport allowance, travel allowance, overtime pay, representation allowance, cashier’s allowances, children education allowance, allowances for recreational and social facilities, and any other bonuses or allowances.
Article (75):
A worker shall, for each year of service, be entitled to an annual leave of not less than:
1. Two days a month, where the worker’s period of service is more than six months but less than one year.
2. 30 days a year, where the worker’s period of service is more than one year.
Where a worker's service is terminated, he shall be entitled to annual leave in respect of fractions of the last year.
So it is possible to file a complaint in front of the labor office and claim through this authority. If it is not possible, it is possible to resort to the court and obtain a court ruling against the work authority and compel it to pay you.