I work as a US call center agent. They also use an overseas call center as well. The companies that I take calls for are large scale. What these companies don't know is this. They have an enormorus amount of unhappy clients. Not because they have a bad product. But because they use overseas operators. Everyday, cutomers thank me for speaking english correctly. They thank me because they can understand what I'm saying.
Everyday these companies lose sales because the customer is tired of trying to make the overseas agent understand what they want. Now, I'm in touch with over 200 other agents daily and each of these agents complain that they get the same calls from customers. I know personally, I've taken my business local on many occasions because of this factor. My advice, spend a little extra, make your customer happy and you'll be surprise the time you save and the profit you actually gain.