If your story is really true, I can imagine it's very unfortunate what happened. I don't think Duelbits are to blame. If the situation really were, then you should just stop placing bets and settle it right away with Dueblbits. No one is telling you that you have to place bets, you do that all by yourself. You chose to gamble yourself, you could also have chosen to post this story on the forum without continuing to gamble.
He wanted to withdraw without making a bet. I would like to know why? If he did not want to bet, there is no point depositing the money in the casino. Casino has certain rules which everyone needs to follow. You cannot use casinos for money laundering purposes.
If he had won the bet, he would have been allowed to withdraw and he would have never complained.
He is frustrated because he has lost the bet.