I'm guessing yours is the one on the right?
If you are sure they did it have you reported it to your insurance?
Or did you walk passed and notice they are not parked in the lines so decided to make up a story.
Guys, please get them on a dash-cam if possible. I bet the first thing they will do is deny it.. much harder to do if the world (including their spouse, employer, police etc), can see them doing it..
That happened to me a few years ago where some one told me a van hit the side of my car.
The witness gave me the make and reg which I took to the nearest police station.
I had to present my car documents and fill out a form. The police then gave me the details of the vans owner so I could contact them. Its best to see if they will agree to get the damage fixed otherwise it means going through your insurance so may not be worthwhile in the long term financially if its just a minor damage.
That stupid driving got him to the back of the queue a few seconds early. He must be so proud of himself.