you dont get banned persay just suspended and maybe demoted a few ranks down
What they do is suspend you for 30 days and then demote you back to the rank that you were before power leveling, if you made a rank if not they demote you down from say you were a 2LT 2 they will demote you to 2LT 1, they also take away some gp that you got from it.
Most of the time they demote you to trainee, otherwise they would demote you to a "reasonable" rank
Actully I Dont Think They Do This Anymore, Cuz its the Second Time i got suspended, first time i wasnt demoted @ all, so i dont think i will be demoted. & since its my second time, will they do something worse if its the 3rd time? lol like they suspend me for 30 days or something /