Sadly reporting something on the tip line doesn't go very far. You need to submit actual evidence. Get everything together to prove the forgery, send it to the consulate, send it to the fraud unit. I can't remember the actual name and how to get their attention to get it to the right department. @TBoneTX probably can help with that information. Once you send in hard proof that it was all a scam, send them proof of who he is married too and all the proof that marriage is still ongoing. Send everything you can think of to backup everything you know. They move slow so it can take years before anything happens.
Talk to a lawyer and see what you need to do to clear that marriage since it is not a legal marriage.