What is the real problem you are facing? They block your account which contains deposit money? or other.
Yes it is impossible for you to include a screenshot of your account if your account has been blocked but at least you can provide other evidence that can substantiate this accusation.
Can you clarify the source of the winning amount since it’s not logical to withdraw without doing any deposit unless you get it via bonus of the casino
maybe he got it from freespin because when I checked into the casino he mentioned there was a freespin feature even though I don't have any details about this