Their support tells that I should do it by myself.
That's their live support. The screenshot you posted in the OP is your conversation with a support agent on their live chat. Send an email to the email address I posted in my previous post.
I won't quit gambling...
I didn't think you would.
but that saves from losing big sums of money.
Perhaps, but that's questionable. Going around and betting on different casinos doesn't show you want to quit. Perhaps you have self-control to prevent big losses but you aren't looking to stop gambling, and losing is a big part of the game.