I'm in Qatar now. I work 2 years in nass group and...

you can file a complaint at the Ministry of Labor against your employer.
If the complaint stipulated that the employer has delayed the payment of your full monthly salary repeatedly, a new application can be filed in order to cancel the employment contract and then transfer of sponsorship without the consent of the employer.
As the law has granted the worker the right to request the transfer of sponsorship temporarily if there are judicial proceedings between him and the employer.
Here is the text of the law concerning your inquiry:
Article (22)
The Minister or his representative may authorize the temporary transfer of a Foreign National laborer to another employer in the event of a legal suit existing between the Foreign National and his Recruiter, on the condition that the Ministry of Labor and Social Affairs agrees, as regards the laborer who is subject to the referenced Labor Law.
The Minister or his representative may authorize the transfer of a Foreign National laborer who is not subject to the referenced Labor Law to another employer if proven that the Recruiter was abusive, or if required by the general welfare.
For the same reasons, with the consent of the Minister or his deputy, upon the application of the applicant for employment and the approval of the Ministry of Labor and Social Affairs, the arrival shall be transferred to another employer.