Thanks for the advice. What proof should I present? I made a deposit - the system successfully accepted, won a little and tried to withdraw my winnings. After that I was accused of breaking the rules and most importantly blocked access to my account. Absurd.
If you didn't done anything and can prove that, you can provide all of those necessary details that they need. You can just ask them to give back your deposit and don't include the winnings.
In that case when they want you to deposit for another amount, it's already a red flag. It's sort of forced deposit because they hold your initial deposit and extorted you to deposit more of it, you should have just asked them to return your initial deposit.