My honest review on this case is, Roobet should allow yahoo62278 to withdraw his won fund. Whatever mistake its came from website, not from the end of yahoo62278. Since there was possibility of lost fund so yahoo62278 were on risk. But luckily yahoo62278 won the fund instead. Refusing withdrawal of that fund isn't right decision for Roobet. What I understand from OP, he had tried to discussed with Roobet about withdrawal, Roobet failed to convince yahoo62278 and result is scam accusation. Roobet should know that even a newbie bitcointalk user could open scam accusation so why yahoo62278 can't? So they should think first about their reputation instead of money. I think it wasn't very big amount by the way.