I would definitely just let it be. I know it's real easy to start thinking revenge type shit, but really aside from violence there aren't many options that are actually going to result in you getting your money back. The guy isn't going to be like, oh you annoyed me so much, come by and you can have you money and some extra for your trouble, he's obviously not a decent person or you wouldn't be in this situation at all. The fact is some people are assholes and some people are desperate, live for the moment and just don't give a fuck about you or what happens to you. When you get into the game, the primary objective, besides finding a reliable source, is learning to differentiate between what's legit and what's bullshit. Try to take comfort in the fact that usually people get what's coming to them and those who deal in less than honest terms almost always end up being their own worst enemies. I once had somebody take quite a substantial amount of money from me and even though I was upset I had two things to be thankful for: I wasn't in jail and that I was able to find out this person's true nature before anything else happened. And you know what? That person ended up getting a gun held to their head and getting robbed for over 2 times what they had taken from me! On top of that the dumb ass tried reporting the robbery and the newspaper ended up printing an article about the robbery and how he was a drug user who got involved in a drug deal gone bad then called police and lied about what happened. I hope things turn out well, but even if they don't consider yourself lucky and move on like everyone else has suggested.