I had a similar experience with a player, accepted the match, first hole tee's off and says, you are cheating, get rid of those clubs and balls and we can finish the match.
Kept at him, played through 3 holes of him hitting every ball OB after 180 seconds, turns out he was 9, playing on his brothers account. Sent a message to WGT, and they banned him until proof of age was received.
I recommend sending these people to WGT email, since we can't burn them here. I did for a while keep a list of do not play on my wall of my profile as a reminder, I recently removed it because luckily I havent come across any of them in a while.