Well you have to clear your debt now. or You will have to bring a guarantor (Qatari) to guarantee that you will pay back your loan.

You need to clear your overdue installments first and then have to meet anyone in collections of mashreq bank.

You can try and convince them by paying 2-3 addtional installments and tell them that You need your travel bank to be removed as you have to attend interviews outside qatar.

I hope this helps.