I don't really understand how much of a problem this gives to gambling addicts as I can control it even though I had been betting for a long time.
Now, about the e-mail issue. It seems to be getting longer and longer and it is not going to a good ending.

How much of a refund are you looking for? Did you remember the balance of your account and have proofs like screenshots? Maybe we can help more if you can provide that.

Second, if you really want out then do so by cutting all the connections like e-mail promotions or whatever it is. A simple solution is creating another e-mail which is easy nowadays.
But if your e-mail address is more important than preventing your gambling addiction then continue but I don't think this will end up the way you wanted and might even cause more trouble for you mentally.