They seem to be active here so have you DM'd them to inform about this OP ?

if you can not DM let me know i will notify them for you

I have read your thread on casino guru, did they mention exactly when your country was banned?
They probably have the right to confiscate winnings after that date, but i do think any winnings before the ban should be paid out in full.

Not notifying you immediately or not even providing a grace period is not the way they should have gone.
are u aware of any other players from poland with the same issue?