well imo anyone could come up with the excuse that it was some1 else playing on your comp. not to mention that you have to take care that, whenever you let a person play with your account, this person wont do shit with it.
i know youve been playing a lot on office but ive seen seen a lot of ppl starting things they shouldnt have. so with that being said i tend to say the ban should stay. you wouldnt be the first person who comes up with it was my bro, kid, friend etc.
just my opinion. the final decision is up to jackd i guess.