I believe that is the case here, the ops bets were cancelled because of possible abuse of the casino T&C and since the ops have all his bets then cancelled, he was free to wager a small amount 5x before he can withdraw the deposit, I don't see any big deal in this because of ops is as good as he claims, he should have won the subsequent games not being left with only $59 withdrawable balance.
-Something doesn't sound right with ops claims and only the support can explain better, because they will have more proof to support the decision.
He says that he was required to wager the deposit amount 5x, which means, if he deposited $500, he must have a total wagered amount of $2,500 which is 5x of $500, but, in the process of reaching that threshold, he lost his capital and only $59 remained for him to withdraw from his initial deposit and after all the wins and losses.
About the cancelled bets, the support, as shown in the screenshots he included, has told him that the bets were cancelled by the game provider and that the initial bet amount has been refunded to him. So, there's also a possibility that the amount was refunded but since he was still placing bets, he didn't notice that.