This is an Indian Identity Scam out of Mumbai or New Delhi, India. They have some if not all of your information and are looking to get you to send them more and to send them money. I have not fallen for it but remain on the list for at least 2 years now.
Like bird doodoo they drop in every few months or weeks with a new number or set of numbers. They are vile and are no more than criminals, similar to the ones that raped and killed the girl on the bus in India in January 2013.
They are the worst of the worst and you MUST report every single call to the:
I get several calls through out the day from this number and when I try to call the number back and gives a
a busy signal then I tried again and it never rings.