Good morning ma, how I do know the sponsor of my...

We would like to inform you that in order to know details about the sponsor, then you can go to the labor office as he will be registered there, so you can inquire about him there by providing a copy of the visa.
For taking your passport, the law prevents the employer to take the passport, so you can ask to get it back if he refused, then you can file a complaint in the nearest police office and you can provide a copy of the complaint in the labor office to show the sponsor violation. As the law allows only the governmental entities related with the Ministry of Interior to take the passport with legal reason for that. Otherwise is considered legal violation as the private companies shall not take the employees’ passports.