My brother is qatar and today his company...

If your inquiry is about the termination of your brother's employment contract, find the following information:
If the termination of the work contract was arbitrary and subjected your brother to an unfair dismissal, in that case the worker (YOUR BROTHER) can file a complaint to the Ministry of Labor
In order to return him to work or to obtain compensation for the arbitrary dismissal from work.
However, if the work contract has expired legally, then the company must pay the worker the value of the reward for this service, in addition to the flight ticket
The Qatari Labor Law in regards of your inquiry

Article (64)
A worker shall, before his recourse to the competent tribunal, appeal to his employer against the penalty inflicted on him within seven days of being aware of such penalty. The appeal shall be decided upon within seven days of its submission. The appeal is considered rejected if this period lapses.
In the event of rejection of an appeal or if it is not decided upon within the above period, the worker may appeal to the Department against the penalty inflicted on him with seven days of the date of rejection.
The Department shall decide on the worker's appeal within seven days of the date of the registration of the appeal. The Department's decision shall be final.
As an exception the worker may appeal against the penalty of dismissal from work to the competent court.
If the court decides that the dismissal is arbitrary or in violation of the' provisions of this law, it shall either annual the dismissal, orders the return the worker to his work and payment of his wages for the period he was not allowed to work in implementation of such penalty or payment of a suitable compensation. Such compensation shall include the wages and other benefits denied to him as a result of such dismissal.