Hello am Josephine, I have been working in Qatar...

We would like to inform you that The Qatari Labor Law does not grant the employer the right to terminate the fixed-term contract in a sudden manner. The worker is entitled to file a complaint with the Ministry of Labor and Human Rights Department at the Ministry of the Interior against the employer in order to obtain the necessary compensation for the illegal termination of the employment contract.
You can apply for a new visa if the previous employer cancels the current work visa
Here is the text of the Qatari Labor Law relating to 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.