It is completely the responsibility of Bitpanda team here. Why did they refund the deposit to a single address when the deposit has come from multiple addresses? Did they tell you any reason for refunding the deposits? Occasionally, casinos process the withdrawal of the users from multiple other users deposited funds, not from the hot wallet address always. If I'm not wrong, then Stake has done the same thing in your case. And it is the rules of every casino that you won't get the funds by any means if you deposit to a wrong address.
100% agree.
The only thing here is that stake can resolve the issue in minutes, the only option Bitpanda have to correct their mistake is to pay me with their own funds.