My boss got mad at me yesterday because i wasnt...

Failure to answer your manager’s call is not a reason to terminate your service unless the failure to respond has caused significant harm to your employer and you can file a complaint with the Ministry of Human Resources and Emiratisation to obtain compensation for an illegal termination of the employment contract in addition to obtaining an end-of-service reward and flight ticket if you will return to your country
You can check with the police station to open a complaint against the business owner for refusing to return your passport
Article 123
1. Where a worker is arbitrarily dismissed, the competent court may order the employer to pay him a compensation, to be assessed by the court with due regard to the nature of the work, the extent of damage sustained by the worker and his period of service, and after investigating the work circumstances, provided that such compensation shall in no case exceed the worker's wage for three months, calculated on the basis of his last wage.
2. The provisions of the preceding paragraph shall not prejudice the worker's right to the gratuity he is entitled to and the compensation in lieu of notice provided for in this law.
Article 131
Upon expiry of contract, the employer shall bear the cost of the worker’s repatriation to his point of hire or to any other point that was mutually agreed upon. Where a worker joins another employer upon expiry of his contract, the latter shall bear the cost of the worker's repatriation at the end of his service. Without prejudice to the foregoing, if the employer fails to return the worker or to pay his repatriation expenses, the competent authorities shall do so at the employer's expense and may then recover any expenditure incurred in this connection by attachment. Where the reason for the termination of the contract is attributable to the worker, his repatriation shall be at his own expense if he has the means to pay.
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.