If you try to join and it states a kick message every time you join, its safe to assume that you've been banned.
If you've been banned, the message will say something like "You have been kicked off (<Rule number> by <Staff name> on <Date> which is our standard format for the ban. From what I can see in BM, I can confirm you have definitely been banned.
Assuming that you would like to appeal this, feel free to follow the link below.