I've recently opened a dispute to get my account unbanned from 12 months ago, they're looking into this case and this was ban was because I said "Why do you play
retros?" I do believe they will unban it if you go to help.habbo.com/requests and make a new one!
All I can say other than that, be persistent and keep trying!
@
pasta;
Edit: If they aren't responding to you also make sure you keep replying in the dispute case as it will keep popping up on their system then hopefully become a "important" case or it maybe classified as spam!