Lets just say someone sold me fake coke what should I do to them

I think murder is a bit overboard but should I just beat his ass and take all his money or burn down his house or something?

Don't buy something that you have never used before or know anything about it, when it comes to non-legit sources.

Threaten him for the money, if he/she refuses tell police that there is a coke dealer in you're area, and nothing else.

Or just try breaking into their house?

cops don't really care if you tell them there is a coke dealer. I knew a pretty cheap piece of shit coke dealer, and I reported him to the DEA like 10 times, they didn't do shit. I say, beat his ass, with a stick or something, and tell him if he doesn't give you some real shit, you will make him remember for the rest of his life and disfigure him or something. I hate that shit. Some one tried selling me capsules with sugar in them as ecstacy, and I was just like...wtf? idiot. I have never seen a capsule of ecstacy.

If you tell the police there is a coke dealer then they will and must check it out.

the wont, actually probably just to get free coke.
there was a shooting of a cop in the next town over. the cops were either on coke or buying it and something went wrong.

mad cops around here are on coke, same with our firemen