Your application for self exclusion was still in progress but you went ahead to deposit money into your account, if you were serious concerning the self exclusion you shouldn't have deposited money knowing fully were that you're trying to wuot for a while. So it's your fault afterall, moreover I don't think you'll consider suing them or querried them for allowing you deposit to your wallet while you applied for self exclusion.
Lol, you are blaming the OP, what if he was just testing to see whether the self exclusion actually worked or not. I can understand his enthusiasm to see that what he applied for actually worked or not. You said the casino was still processing his request before he made another deposit, how about he try it again and see if they have finally concluded in approving the request. He should give us feedback if he tries it again.