Am I being scammed or sued?

I had reversed my car into the parking space. When I got into my car and prepared to drive out of the lot, I waited for another car to drive by slowly. As I was rolling out of the parking space, the other car suddenly sped up and I ended up slamming into his side. Both of us got out of our cars and the other guy apologized a lot. He told me that his car is very old and a few new scratches and dents wont make a difference. My car had almost no damage except for a very tiny dent on the bumper and small spot of paint that had come off. We exchaged our phone numbers and I took a snap of his number plate with my phone (just in case).

Now after a couple of weeks I get a call from a collection agency claiming that I need to pay for a collision claim which could not be collected by the insurance company because they couldn’t find me. My question is this: Is this some sort of a scam or did the other guy play me and filed a claim?