Gambling addiction is a serious problem that needs to be addressed. It was a good thing that you advised the stake back then to have you self-excluded to avoid further damage on your mental health and overall well-being. Stake should be responsible and should be liable for their actions and lack thereof from what had happened. Because their staff told you you have been permanently banned already, but turns out it didn't happen and you still managed to enter, deposit, and play some games once more, which resulted in losing your money deposited. Actually, both of the parties had their fair shares of fault, hence, the best thing and justifiable thing that could happen between the two of you is to meet halfway. Because the moment you managed to logged in, you should have contacted their customer support and reported to them instead of depositing again.

I just hope next time the casinos would be more keen on their actions most especially if it involve gambling problems because players are the ones suffering from it. Although despite this, I also think that refunding just because you lost is unfair too because if it happens that you managed to deposit, play, and win, I doubt if you would ever surrender your prize and just volunteer to get your money back. Gambling is not a charity after all. It is also a business that needs to profit. Hence, refunding without undergoing the proper process would be a loss to them. Just try to reach them out once more and comply to what they will ask you. And then just meet halfway since both of you have your shortcomings.