Well point them in the direction of this thread :)
Firstly the ban at GGC seems to have been triggered on a US IP, you are in Canada.
Secondly, the only IP that ties your GUID's together was used on your GUID in Jan 2007, on the GGC banned one it was used in September 2008.
Banned GUID has been used in USA since october 09
Your GUID has never been used in the USA. Unless you have a private jet I doubt very much thats you!
I think those are the facts as I see them so maybe they'll re-think your ban. If not, I think there's always Plan B :)