Motzie shem raah. Capital One only has the Pakistani ones on weekends, on business days they have fluent americans.
I never got a American rep. Maybe I never called in during the week days, but I believe that at least 1 out of the 100 times I called them I did, but I can't remember getting a American rep even once.
But maybe you're right. But in any case, it seems like Chase and Amex do manage to get some American agents even on weekends, I believe all what matters is the few extra bucks that they are willing to give to serve their customers.