My friend was falsely accused at the police station by a man he doesn't know

My friend was falsely accused at the police station of not paying back the money he owed, but my friend didn't know the man who said he owed him the money.

The man lost contact with the police after he went to the police station. The police can't contact him now. My friend also has no way to leave Dubai because of this case.

How can my friend leave Dubai now?