Hyundai Motor India — Vehicle is not repaired even after 6 months

My car met with an accident on[protected]. I handed over my car to M/s Sarweshwari Hyundai representative. They committed me on that day that car would be repaired within a month. But as days passed, my calls were started un-answering. It is almost 6 months passed as of today. They are not even replying properly about the fault of my car and car is not yet return back. They did not even replied properly. I am very much sure that they have done research with my car and it is damaged. Now I am totally confused on what to be done. Regards Abhish R +91-[protected]