Most Indians speak very good English, at least in the cities, AFAIK. I've
never been to India, but all the Indians I've met elsewhere spoke perfect
English, albeit sometimes heavily accented. They have many different
languages and use English as a lingua franca to talk to other Indians in
their own country, so complete fluency is more the rule than the exception.

I know that most Indians speak good English, and I have no problem
with their accent. But I had one once who apparently did not
understand English. It was as if he was reading from a script and was
expecting a certain answer back. It was VERY frustrating. Perhaps if
these call centers were a little more discriminating in who they
hired.