Rest assured that we always tried to give it here, like repetitively mentioned by members who frequently overseeing cases on this section, "this board runs on evidence", so as long as every side give their piece and backed with a fact, we don't judge with prejudice [well... most of the times, LOL].

This is also why I invited Blackjack.fun's representative here, I'd like to know how sure they are with the accusation. When they come here, I am intending to inquire if they're sure with their data. As OP already submitted his KYC, it'll be easy to be sure if he's indeed multiacc-ing by matching his documents with the database.

Now, a separate issue, the fact that they... share some information with you, it's not clear whether the data they share are "merely" IP address, emails, and the likes, or something more serious like the KYC documents, I hope it's nothing sensitive, although even so, I am not sure if it's a good idea, for a company to share such a private matter with a third party.

Some casinos have created a negative impression on the forum by not replying to the accusations in a timely manner. The forum member doesn't go against the casinos usually. Most of us want to get an explanation from the casino side when someone creates an accusation with enough evidences. The OP hasn't provided enough evidences here, except the email logs. And I'm wondering why he is unable to post the deposit tx id. The tx id can be easily found in the wallet or any other service from where the deposit was made.