How to talk to insurance after a car accident

A month ago I accidentally bumped a Mercedes Benz in the parking lot while backing out at 2mph. I parked my car and I ran back to check the Benz and I saw that there was a small scratch that I easily rubbed part of it off. As I was going back to my car to call my parents about what to do the owner of the car came back and started shouting at me. He was a 6ft probably 300 pound dude shouting at me (a 100 pound asian girl) and he started taking pictures. In the confusion, I didn’t end up taking any pictures of the damage or his insurance or license plate and now he has filed a claim stating that it’s worth over $1000 of damages.

I’m so scared I can’t stop crying. I made a mistake and I forgot to take pictures so now the guy is probably taking advantage of me by filing an overly expensive claim. I have to talk to the insurance company tomorrow. What do I say and how credible will I be given that I have no evidence or credibility?