The only way to do this is to hurt the receiver in some way, or to claim credit card fraud, in which case you may get your money refunded and the CC company has to deal with it--that is, if you used a CC. And, WU often calls just to make sure you are the owner of the card, but that doesn't mean anything. Your friend staying over or your teenage kid could have sent the payment. Otherwise, if you report to WU company that you think the receiver is involved in fraud and would like your money back, you might make it hard for other customers, so I would advise against doing that. Already, this company seems to have a bad reputation with the WU reps on the phone.

Good luck.