Are you the teacher? Throw him out of the class immediately he gets out of hand -- not five minutes later. It can be an effort of willpower, but in this case you have to stare him down until he leaves. Whether or not he gets his money back is between him and the head of the school. Neither you as a teacher nor your other students need his nonsense. (If he has criminal connections, though, I honestly don't know what to say.)
Are you a student? Ask the teacher to throw this guy out. If necessary, complain to the head of the school.
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