Taking a few minutes to ask for an AML (anti-money laundering) check can help protect your money. A trustworthy service that values your privacy should be happy to do this for you. Also, don’t send a big amount all at once always split it into smaller parts. That way, if something goes wrong with one part, you won’t lose everything.
Remember, crypto transactions can’t be undone...
I can't imagine any person can send such a amount at a time while the transaction is not undone and legal procedure is too slow and the more important thing is that to get legal solution is almost impossible. In this state I think the mistake OP has been made and now the op is suffering a lot. I wish Op will get back the money but who knows what will be happened.