Employer's right to deduct damages from the employee's EOSB in case of mistakes

Hello,

I'm structural detailer/draftsman. My employer terminated me last Nov. 30, 2020, due to some mistakes of work.

But now more than 1 month already he doesn't want to cancel my visa and he told me to go back to my home country without cancelling my visa.

Otherwise, he will file a case against me due to my mistakes and he wants to deduct the cost of rework and material scrapped from my settlement (AED 15k of total cost) due to my mistakes.

Hope you can help me and give advice on what to do in this situation.

Thank you in advance.