1Xbit and 1Xbet are probably the worst casinos you could find. just as you found this forum to make a complaint, you could also read here a lot of accusations about the work of these casinos.
You can withdraw as much as you deposited, sir.
are you sure you are communicating with the right person from that casino? Despite the lousy reputation of 1X...casinos, the word "sir" seems to me to be from a fraudster, rather than an official.
After this message, I checked the last investment in the stock market, it was 1199 dollars, but when I entered my account, there was 153 dollars, my balance was deleted.
is your account blocked or do you still have access to it? can you extract the betting history and all changes on your account, maybe you or someone on your behalf placed bets and lost?
I don't quite understand how you don't know how much you made a deposit here. Can that $1199 be the amount with all the winnings?
are they really right when they say that you had multiple accounts on their platform at the same time? If you are, then they have the right to follow their own rules and you don't have many reasons to be proud.