if the scratches are from unknown accident/incidents, Try visiting your nearest traffic police dept, take a token and wait for your turn.

Please make sure you take your car's insurance papers, Istimara (Vehicle registration card) along with you. explain them about the accident or tell them about the scratches that you need to get painting done, they will charge you Qr.50 to 100/-(not sure) and give you the police report papers. Once when done, visit your insurance co. for claiming, you need to show them your police report and they will refer you to a garage.

If you dont want to go for insurance and get it done by your money, visit any garage and show them the police papers, they will handle your job.