I would like to know the amount involved that was converted to tokens and gambled away. I think there is a flaw in their security system because from what I have read, there is a notification because there is situation of wanting to send to an external address but nothing when its being converted to tokens. I also know other exchange sites have this form of voucher which can be raised on different accounts on the platform and when redeemed the owner of where the voucher originated from is not notified or his confirmation gotten before the transaction is finalized which could make hacking a successful one.
Unfortunately, there is nothing you can do about it as it has been gambled already while they won't admit that you account was compromised because of PR issues. There is a lesson to be learnt though and that is never trust this exchange sites with your fund so far its something that would disturb you if lost. No matter how small.
Exactly what @LTU_btc said. What if your account was never hacked and you just gambled away all your coins? If you win, you get a lot of free coins which you can withdrawal. But if you lose, you have an excuse for losing and hope that Coinpot is willing to recover your coins. Basically gambling without risking your coins.
Of course I'm not saying that you did that. But Coinpot can't assure this didn't happen.
I think there should be log of mails sent to customers if coinpot would respond this could be a defence on their part but other than that, its possible his account was compromised.