Customer Service Center? That doesn't even exist at my Walmart! I've complained in the store and no one speaks english well enough to understand me, so I figure the situation is totally hopeless. The Best Buys store is almost as bad. Half the people speak english there, but no one even knows the names of their managers or where they are located. There is no such thing as good service in these large stores.
The language problem may have more to do with the area of the country you live in. I live in central Illinois and haven't had that problem with anybody but doctors.