there are several ways that bliz bans ppl. for example on Diablo2 they temp ban ppl for 2hrs-8hrs.(ppl say if u try to login while on temp ban u will get ban extention. lol) if you keep login-out bnet simultaneously.
or 2weeks on or month one.
I've been banned from bnet since i was swappin my cdkeys for my bot for diablo 2. lol
hope this ban lasts short for ya.