Bummer! I hope it's not too difficult (or expensive) to repair!
It happened to me, too. Back in the middle '70s, I followed an "old" (surely in her 70s but I don't like to call that "old" anymore!) lady in a larger car (they're all larger!) down a street. A little later, we both found out that the street was closed and before I could backup out of her way, she backed into me. There wasn't much damage and I told her I thought the damage would be $20 or $25. She gave me her phone number and insurance information.
When I got it fixed, the bill ended up being over $60. I called the insurance company with the bill. A couple of days later they called back refusing to pay. I called the old lady and told her how angry and disappointed I was that she lied to me! It didn't help so I was on the hook for $60, which at that time was real money to me!