Too harsh ban.

Greetings,
I was today having troubble with an elite quest in arathi mountains so i made the stupid decision to get my brother“s account (lvl 60 warr) to help me pick a quest item , i was not in the account longer than 5 mins but looks like it was time enough for GM to ban me without a warning. I was absolutely unaware of this rules ( i know its my fault) and i can promise i wont do it again but my warlock lvl 34 got banned even tho the GM said it was all fine if i didnt do it again.
Imho i dont think i did any major harm against the server and i ve learn the lesson, please i beg for a second opportunity.
I wish i can contact a GM in private to talk about the matter, thanks for your efforts.
The conversation with the GM was this :

I was today having troubble with an elite quest in arathi mountains so i made the stupid decision to get my brother“s account (lvl 60 warr) to help me pick a quest item , i was not in the account longer than 5 mins but looks like it was time enough for GM to ban me without a warning. I was absolutely unaware of this rules ( i know its my fault) and i can promise i wont do it again but my warlock lvl 34 got banned even tho the GM said it was all fine if i didnt do it again.
Imho i dont think i did any major harm against the server and i ve learn the lesson, please i beg for a second opportunity.
I wish i can contact a GM in private to talk about the matter, thanks for your efforts.
The conversation with the GM was this :
