A question for native north american english speakers

Hey, I happen to know a guy here in Mexico city who claims to be an english teacher and has a phrase he keeps repeating all the time, he says: "thanks for believe" to the people who supports him.

Yeah, that's right: "thanks FOR BELIEVE"

He claims this is correct and even argues that he has travelled to and lived in the USA, and that we don't know the rules that americans use to speak...

So please, could anyone here be so kind to clarify this?