Withholding of EOSB upon resignation and serving notice period

Hi,

I have been working for a reputed company in Dubai for 2.5 years. I resigned from the company and served my notice period as per my contract.

Upon my last working day, I submitted all handover. They asked me to hand over my passport and they will only give my final settlement once I cancel my visa and show them the exit stamp or show them new visa if I get a job in Dubai.

I sent them my visa status change copy as I got a job in another company. It's been 2 months, and now my ex-company started raising questions on trivial things like "where are stationary, pens, files, the box, they can't find stuff...etc.", though I gave a handover.

I have been following up on my gratuity & final settlement, but they are not replying and not even informing me anything. No reason was given for holding my money.

Is it legal for my ex-company to hold my final settlement?

I have served my notice period, have a clean record, no warnings, no misconduct.

Can you please guide me? What can I do to get my final settlement?

Thanks

A