After getting offer letter I work in a company in...

If the employer reject the payment of the salary, you can do as follow:

-file a complaint at the labor office against 

-file a lawsuit before the judge immediately as article 5 of the labor law states as follows:

All the proceedings in the court and filing a case as well as execution of the claim which filed by the worker are exempt from the payment of fees according to the provisions of the law. the court bay accept or refute the case also may decide to remove or impose the fees