it sounds like similar thing that happened to me. I was driving home late one night, minding my own business Was flashed and beeped by a car behind. She was siganalling me to stop. We stopped. I got out not knowing why she had wanted me to stop, then the woman started shouting at me and said that I had damaged her car. i looked at her car and it had a massive dent on the wing, looked at mine and not even a scuff.
I told her that I was a fleet manager, which I am, and told her that faking an accident so that she could have her damage repaired by my insurers was fraud. I took photos of her car, reg, my car with her next to it etc etc.
I got home and called the insurers straight away to advise them that some nutter was trying to make out that I hit her. A) I was in front of her, B) IF I DID it her I would have felt it C)I would have damage.
I got a letter stating that the 3rd party had admitted liability, wierd but understandable as it was a load of crap. Then I get a letter saying that she had withdrawn her statement and said that I was to blame. I wrote a letter, enforcing thatI am a fleet manager and deal with these sorts of bogus claimns everyday. sent them the photo, witness names and basically explained that it would have been impossible for me to hit her car. That was last year. nothing since then. People try and get old dam,age repaired by blaming inoncent drivers and claiming off their insurance.