An employer asks the employees to sign cheques to get their salaries

My previous employer had a policy where we had to give him a cheque for 15,000 AED addressed to the company in order to receive the salary. This way we could not leave the company before finishing the contract.

I had no choice during that period as I wanted a job badly and gave the cheque. In return, I sent an email to the company stating that I am giving the cheque as per the company's request and I haven’t taken any loan from the company.

In 3 months, I got fed up with various unfair policies in this company and left. I didn’t sign a labor contract with the company as I was working on a visit visa. When I left, I requested my cheques back but got no response.

Just yesterday, this company bounced my cheque.

Can I go to the police and complain against this employer?

What are my options now?