Not too long ago, I was banned for 72 hours from WoW and received a final warning - for reasons unknown, so I couldnt know what I did wrong and because of that the final warning was as good as a soon to be permanent ban.
After a few days of talking with different GMs, one told me it was due to account sharing. I did not share my account, only my IP addresses change often, due to different locations and different PCs. So I told them that, but they still didnt listen. After 4 weeks I finally got a reply from a supervisor, who said he could confirm the stuff I claimed and that the final warning was canceled.