I did not say you have done so - it was a conditional sentence. But let's put that aside.
Now you're saying you had a gambling problem; despite the fact that I'm sorry to hear that, it is crucial to inform the casino. Naturally, players register to play, not to close the account immediately; hence, it is super important to describe all things related.
I can't give you a straightforward answer regarding the refund, because saying the casino acted badly with you and you should not have spent money there is not a concrete description of the events.
I suggest you explain each event using a time line. I'll give you an example
day 1: I registered at Posido and made deposit
day 2: deposited again—three times in a row
day 3 : lost the whole balance, asked casino to close my account
day 5: they offered me a bonus if I stayed, and I accepted that
and so on...
Automatic translation: