Actually its all written here
https://rollbit.com/terms-and-conditionsIf they just spend some time to read their TOS for sure that they would know this.

Now they know that casino is really doing an action towards multi account and to bad for some people that they realize late that they have rules like that that's why its important to read before deciding to gamble so that they can possibly avoid this violation and can gamble clean on their casino.
Users who want to contact or escalate their issues can contact the team with two emails as far as I know.
One email is in the screenshot:
support@rollbit.comAnother email is
compliance@rollbit.comHave you try to reach them through writing to
compliance@rollbit.com or is it just through live support this far?
It's
compliance@rollbit.com, once they have an unresolved issue.
Razer informed me when I reached him personally, about a good few weeks ago, that Rollbit is trying a new approach to resolve complaints that's raised against them, since most of the complainants are escalating on multiple platforms at once [this is partly the same reason why I always encourage complainants of any casinos to try to get it deescalated here instead of simultaneously raising to ADR and/or other media], not just this forum, that make things harder to track for Rollbit.
So they decided to try a new approach with them channeling all complaints into one channel, namely their compliance desk, and will make follow-ups with other platforms [ADR, trustpilot, bitcointalk forum, X, or others] if still needed when the situation resolved. And so far, it works quite good, given some cases got resolved.