mgm sold the accident car

I bought the used car Hyundai i120 2012 module which was having 30000km and was still under warranty and having service plan and i was not informed that the car was once been involved in an accident or it was once taken to a penal biter until I the car got stacked while i was driving it after 4 days from the service.the car was towed to Hyundai polokwane and it was supposed to be fixed under warranty and Hyundai refused as they discovered that the car was once involved in an accident as they saw some paint inside as it was showing that it was once taken to penal beater.so I took the car back to MGM and they refuse to fixed.