The same thing is happening to me too. I retired in July 2011 and the phone calls stopped. Now over a year later they are starting up again. I guess they're running out of people to scam and have to harass people who ignore their calls. I have a block on my cell phone so if they leave a message it goes right to voicemail. It just gets so annoying.
I also got a threatening message from an Indian man with a thick accent telling me that I must not ignore the message and to call immediately or God help me with the events that are going to transpire upon me. I am so relieved when I looked this up and saw this page of comments. This is a scam and I also inquired about a payday loan but did not complete the application. BEWARE of FRAUD!