Sir i have total 4years of sales experience in...

 We would like to inform you that You must file a complaint at the Labor Office against your employer that he refuses to pay the work injury compensation

You must file a complaint via this link

Complaint at the Qatari Labor Office

if your contract is limited, then you must obey to the contract period in order to avoid paying compensation to your employer. Moreover, if your limited contract is valid, then you can’t transfer the guarantee without the employer approval.
However, if your contract is unlimited and you spend 5 years, then you can apply to another job without the employer approval. Keep in your mind that you must obey to the notification period that issued in your contract.

Article 21

The employer, the Competent Authorities, and the Ministry of Labor and Social Affairs may agree to transfer the Foreign National laborer to another employer before the time limit in the contract has been reached or after five years of working for the employer if the contract did not specify a time period.

The Foreign National laborer may, with authorization from the Competent Authorities and the Ministry of Labor and Social Affairs, transfer to another employer in the event of the Recruiter’s death or dissolution of the body corporate for any reason.

In all cases, the employer serving as the Recruiter shall not have his legal rights, nor the contract between him and Foreign National, violated, in accordance with the referenced Labor Law.

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.