User blog comment:THGA/My experience with support/@comment-7333916-20130907085157/@comment-7333916-20130910092017

Well, I did spend some money (not much) and the Island is only on level 35, so that's not the reason here.

After waiting one week for an answer, I was unbanned. They explained that I was banned because I changed the system time while the game was running. I can't remember doing that, but I definitely didn't get any of those "time cheat" warnings.