I had the same problem as you! I bet €195 and won €800, with no bonus. When I tried to withdraw via SEPA bank transfer, which is my only withdrawal option, I selected the withdrawal. Five minutes later, the payment was refused due to an internal banking issue at the casino.
I then contacted customer support, who told me that bank transfers were not working, meaning I was unable to withdraw my winnings.
I therefore closed my account, as after doing some research, I found that many people have had the same problem as me.
The casino even advised me to use cryptocurrency in order to recover the funds, which is completely unfair!
Since April 8, I have been sending emails, but I have not received any response. The customer support is handled by AI, making it impossible to get a real answer or speak to a human agent.
Today, I am therefore requesting a refund of my deposits, but so far they are refusing outright, despite acknowledging that they are having issues with their payment provider.

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