This is really a mess, i've never been in anything like this before. I can't even communicate with them. The only way they want to talk, they have problems sending me emails.
You are lucky and unlucky at the same time. You are lucky because they didn't scam big amounts/small amounts from you
yet and you are unlucky because you scammed yourself by trusting their crappy self exclusion protocols.
As many have already pointed out, you will not acquire justice from them regarding this matter. Avoid them completely going forward if you don't want this to become a bigger mess.
As Haunebu said, you shouldn't have trusted 1xbit team to keep up with they words on self exclusion since already their don't keep up with anything that regards to customer cares and issues rather the keep their eye on the big deal which is to scam any amount that their can lay hands on and this time self exclusion with some amount of money in the account is and was a sure way for them to scam you, first thing you are surpose to do is to research about them first before you even make attempts to play on their casino.
1xbits are not to be trusted because already known scam casino what are gambler's still looking for on that casino any ways, because as far as I know even the newest newbies already should know their ethics and practice for long now, in conclusion you ops will need to forget about the whole thing because that money is gone and never make the mistake of having any deal with them going forward.