Hyundai Motor India — Repair feedback

My car met an accident in Alwar in May 1 and was towed to the nearest repair shop that is in Alwar (Modern Hyundai)on the same day. It took them 3 months to complete the work n also they took out the parts of the car during repair and were not fitted back neither given to us. I have to bear a loss of 12000 just because of their silly mistake that they are denying now. I am filing this complaint. I will regret buying car from Hyundai.