How do you report people for scamming developers?

Ok, so recently I was offered 1000 Robux for building a map for a group. I mostly did the terrain and some of the buildings. About a week later, the person that hired me quit on the project and said I wasn’t going to get paid. After I finished the terrain for the map, when he said this I was pretty mad that I just got scammed. I said if he could pay me 500 AT LEAST for my work, but he said the deal was off and just stuck with that. Is there any way I could report him so nobody else can be scammed by him. His name is Kai10Jnert btw.