Claim against the company for holding passport and visa cancellation upon resignation

Hi.

I have worked as an accountant in one company in Abu Dhabi since Oct 2014 under an unlimited contract.

Last Jan 8, 2022, I have submitted my resignation, handed over all the data and completed my notice period on Feb 6, 2022.

Now my employer is saying the data are not proper and you have to wait until they finalize the financials.

They refused to cancel my visa and they hold my passport. Is it legal? Can you advise on what I can do?