Man with Indian accent asked to speak to me.  When I said please do not call back, he kept asking why.  I said I don't respond to spam calls - he asked who said he was spam caller.  I said again please do not call back and hung up.

To add to my earlier message, he first mentioned he was calling about my computer.  What is that all about?

It sounds like this scam:
http://800notes.com/forum/ta-29022e7af5a3050/ ... h-your-computer

The caller talks you into letting him scan your computer for errors.  He finds lots of them - because he installed them during the scan.  Then he charges you $$$$ to remove them.  But he may not remove them.  He may keep control of your computer, using it to send spam  and torment others.

You were wise to hang up on him.