Sounds like you learned something.
If it's a tournament, you play it by the book. Period. It is your responsibility not to let stuff like this happen. You play it down, you keep score, etc. You trust nobody, this is for blood. Sometimes you have to be a bastard if your opponent is trying to bend you over. Otherwise why even sign up to play?
Sadly, **** like this is commonplace in handicapped events.
You'll be better prepared in a variety of ways next time.
Oh, nits never have these problems.
BO