Someone rear ended me and denied liability

I was rear ended last week. The dude gave me his info, and we both talked with my insurance company and decided to file a claim through his insurance (State Farm). During the phone call he talked about damages to our vehicles.

Earlier this week, state farm called and said he denied his car making contact with my car, and they are investigating this. I have some pics of my cars damage, some pics of his insurance info and his id taken at the scene. What’s my best move here? It just seems kinda absurd because why would he give me his insurance info and let me take a picture of his id if there was no contact?

Also, his car has no damage because he has a metal front bumper. My cars rear bumper cracked.