Poor customer service

I brought BMW X6 from BMW Century City salesman Tyler Kunz he hide to me the car has been involve into two accident they sell this car to me like it free accident even now this problem it not resolve since it very difficult to me to trade in this car to other dealership since it have two accident the value it too low to for those accident. I even report this matter to the deal principle Shaun he leave the mater unresolved