Originally Posted by themicah
drbond is correct. While you occasionally may find merchants classified according to the US system (e.g., I think I once got 5% back on my Citi Dividend card for a gas purchase in Canada), most int'l merchants aren't going to show up as the 5% categories, and there's nothing you can do to appeal, since the T&Cs clearly state that the cash back is based on how it's reported, even if it's in error.
That would have been the result of a Canadian station being on the US system. There are a few of those. A couple in the Carribean as well. None anywhere else.