Hello sir I have been working for this campany...

We would like to inform you that in accordance with the Qatari Labor Law, what the employer did shall be considered an arbitrary termination that obligates the employer to pay compensation to the terminated worker.
Article (49)
If the service contract is of an indefinite duration any of the two parties thereto may terminate it without giving the reasons for the termination. In this case the party intending to terminate the contract shall notify the other party in writing as follows:-
1. In respect of the workers who receive their wages annually or monthly, the notification shall be given not less than one month prior to the date of the termination if the period of service is five years or less. If the period of service is more than five years, the notification period shall be at least two months prior to the date of termination.
2. In all other cases the notification shall be given in accordance with the following periods:
A) If the period of service is less than one year the notification period shall be at least one week.
B) If the period of service is more than one year and less than five years the notification period shall be at least two weeks.
C) If the service period is more than five years the notification period shall be at least one month. If the contract is terminated without observing these periods, the party terminating the contract shall be obligated to compensate the other party for an amount equivalent to the wage for the notice period or the remaining part thereof.
*** So you may go to the Ministry of Labor and Social Affairs and file a complaint and claim all the labor rights in addition to compensation for the arbitrary termination.