Account Banned due to Abuse of the Economy‏

I'm posting on a friends account since mine got banned.
Apparently I got banned for abusing the economy and the only thing that comes to my mind is that I have put a few arctic furs for 100g on AH and I'm rushing a friend new to the game, I gave him 250g, dunno if that could lead to an acusation of "selling gold".

The thing is, I was raiding with my guild on Lich King Heroic, the boss was at 13%, I got disconnected and saw the message that I was banned. I got the logs to prove. http://www.worldoflogs.com/reports/m7dajdvndwegpdy4/sum/damageDone/?s=14093&e=15202

Sadly, I lost my guild first kill wich was server first kill. Worst time ever to get banned.

Characters level 80 in my account: Tirantz, Zalasthe and Tirdrood from guild Dota AR BR Banlist ON on Ursin.
http://www.wowarmory.com/character-sheet.xml?r=Ursin&cn=Tirantz