Recently, my vehicle was involved in a crash in a parking lot. I had reversed out of my parking space and moving forward, then a car hit my car from the back damaging the rear of my vehile. I had done the checks and looked into the mirror before and while reversing and there was no cars coming towards. I think the driver was speeding or wasnot paying attention while driving. He came forward and admitted that it was his fault then and provided me with his details saying that i donot need to worry and his insurance company will repair my car. But after wards he falsified the information with his insurance company and said that i was reversing and the insuranceo company is now putting me at liability as he said i was reversing . Moreover, my car has a rear sensor and it would Start beeping if i were reversing a car was coming towards me from like a meter away. What can i do in this situation?