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?