False Accusations of Damages on Vehicle

My car had been in an accident so the insurance had covered for us to use a rental car (from Avis) while our vehicle would undergo repairs.<br> <br> I had returned the vehicle 1 month later and was told that I had scratched the car at the back, which was there initially.<br> When the initial inspection of the car was done, before I had used it, I had pointed out the scratch assuming it had been recorded, however it was not recorded. I am now liable to pay for the cost of repairs for damages which I did not do.<br> <br> Avis cant even arrange for a surveillance camera footage when the initial inspection was done, as this will show that the damage was there before we had used the vehicle.<br> <br> This is very disappointing for a large company such as Avis.