This your story is hard for me to believe because you said they asked you if you had other account and you said know, that means they are suspecting you of using another account to abuse their casino, I sometimes usually don’t believe a story from what one person has said without hearing from the other party however, from the evidence you have brought out your case can be solved because you have good evidence to back up your claims.
Rollbitcom Has not been active for long now they are suppose to look into your case and solve it but I will advise you write this complain also on there
ANN thread too and you can also reach out to them on X.
I’m surprise you are having this kind of issue I have never experienced this issue since I started using them.
If you bother to uhh... read cases with Rollbit post-withdrawal from every resolution medium and channeling things to their compliance team, or one or two posts I've made in latest thread of dispute against Rollbit, you'll easily learn that the accusation of multi-acc is their blanket statement to invite users to reach their compliance team.
One doesn't necessarily need to be detected to have other account. The investigation could be about a bet, or a missing KYC details, or suspicious login, and everyone will still got hit by "multi-account" message.