i resigned from my security job after giving them...

If your inquiry is about to the expiry of the visa, find the following information:
If your visa is canceled, you will be given a period of thirty days, and during that period you have to either leaving the country or obtain a new work contract.
If your visa is canceled, you can apply for a visit visa, but a sponsor must available, such as one of the tourism agencies or hotels.
The General Administration will examine your request and issue a decision to accept or reject the request
The employer is not entitled to retain your passport after the visa cancellation, but this procedure is taken by the employer to ensure that the worker leaves outside the country or obtains a new visa.
You can file a complaint with the Ministry of Human Resources and Emiratisation due to the employer keeping your passport