I got this from the SC2 Forums....
      

  You don't. One StarCraft II license per Battle.net account. If you're banned and want to post again you'd need to open a new Battle.net account and buy a new copy of StarCraft II to post with a new character.Diablo III peoples should be prepared for the same. gt;:)I can't confirm why you were banned but I would have recommended you email in, as ..
      

http://www.blizzblues.com/us/i-got-this-from-the-sc2-forums-26850246527.html