If there has been any blatant deliberate act that traps players in to a cycle by locking withdrawals citing breaches of terms and conditions when there are huge amounts involved, then it is unacceptable. If they do that while at the same time allowing for deposits to take place in order to entice/allow players to continue placing wagers in the hope they lose then unlock withdrawals when the amounts are smaller, it is basically a combination of many words including cheating, fraud and scam.
On the other side, it's worth noting that OP was previously locked from withdrawals for the very same accusation he currently have right now, and that limitation was temporarily "revoked" once he lost a lot. They let him play and withdraw instead of verifying their findings, for a while, only to have that situation reemerged [this time his entire account got locked] when he once again tries to withdraw big.
So, I think it's only fair to consider that the casino also plays a dirty hand here. Since they can still be online from the last time
I tried to get it clarified, I don't think they have any intention to straighten it. And I tend to think the reluctance was due to that the situation is true.
I am not saying OP is not wrong here, the casino's finding might be true, that OP had multi-acc, but that doesn't justify their action to lock withdrawal feature so the player can lose big, unlock it once the balance drained, and re-block them when he tries to made another big withdrawal.
I am leaving a negative tag for this, as it is a trait that's very detrimental for a casino and it exposes the community to a risk.
Metaspin's.com, feel free to pop back whenever you're ready to give plausible explanation.