Clients accident

One of you clients scratched my car while I was reversing from a parking lot. She didn't stop, didn't want us to take pictures. We went to the local police station there is a case number. 6he officer advised us to each fix our own cars we didn't exchange any details and we parted ways. A month later I got a letter of demand she wants me to fix her car for all scratches and it's not agreed on. You company and client is demanding payment. She didn't dispute when the officer told her. Im not happy with your service