What does it take to get an account closed for using a Bot?

CILgel, on Aug 20 2012 - 03:56, said: Had it happen 3x's in a row last nite. Low tiers a T1 Cunny was botting and advertising a website where to buy gold. I reported him as a bot but not about the advertising. I can pass on its name if you are interested. Unforunatley I did not have a replay and didn't think of taking a screenshot. I did write the name down and did a member search as he shows up with 0 stats on everything. How can that be?