When my employer cancelled me and agent refused to...

We would like to inform you that if you are an expat   and the employer took your passport, then the employer doesn't have the right to take it. So you can claim for it, and if they refuse then you can file a complaint with the police and provide a copy of that complaint to the Ministry of Labor to prove the violation.
Note that the law allows the governmental departments that belong to the Ministry of Interior to take the passport, otherwise it is legal violation such as the private sector.
***Therefore, a complaint can be submitted before the Labor Office, as it is the competent authority to end labor disputes, and it is the one who obliges the sponsor to return the passport, as long as the visa has been canceled, this is generally

Dear, your question has been answered in the previous answer as it includes the legal procedure in the last paragraph in it for the purposes of returning the passport in terms of submitting the complaint before the labor office, and it is the one who obliges the sponsor to return the passport to you