Why don’t you call your HR and explain you situation? In normal case your end service Benefits will be transferred to your bank account. Bank has got the authority to deduct you credit card balance and any others payments due from you.

Then again, if you did not serve the notice period mentioned in your contract, they are not obliged to give the full settlement. But you will be eligible for your gratuity, leave salary as per the Qatar Labor Law. Better approach your company through a lawyer.