I went abroad and applied for a tourist visa to Dubai. Now that the visa has expired, the company has not given a long visa. I can't find the company, and someone else has taken my passport. ...

Your situation is very troublesome. If your visa expires, you are already black. If the police find out, they will be sent back to China for several months or fined. Now you have no passport! I'll ask my friends in Dubai, don't worry, I'll leave you a message later! What are you going to do now? Get your passport back quickly.