OP I think the solution to this case is quite simple, you say you lost your phone, so you only played at the casino using your phone something that the casino is denied and they confirmed that the owner of that account did not enter the casino using the phone, then the casino says that you don't even know the email used to create an account at that casino, so you also don't know your email address that you created an account at the casino? at least you don't remember your email that you created account at the casino? how is this possible? you played with millions of dollars but you didn't enter the casino with a computer and you only entered by phone? don't you think this story is very strange?

you made deposits at this casino, so why don't you give them the address you made deposits at? Did you also lose your wallet and the address where you deposited? Does that mean you didn't protect your wallet even though you were moving thousands of dollars? your whole story is doubtful and in this case I really think the casino is right in the measures they are taking