st No voice just an open line with no sou "nds.

returned call to disconnected number

Automated voice said it got my number from one of my retail stores and  I had a chance to win or receive (can't remember exact words) $100 in gift cards or grocery bills if I press one.  I waited for an option to put me on a do not call list but it never gave me another option.  I finally pressed nine and it immediately disconnected.  Calling back says the number is disconnected.

They called back less than ten minutes later. I forgot to mention that it costs $4 to get this so called gift certificate. This time I pressed one hoping to get some info from these guys. The caller had an Indian accent and claimed he was with a start up company called Blue Savings based in Florida. Of course a subsequent search showed no company registered under the Secretary of State  or anywhere else in Florida with that name. Surprise surprise.
Anyway, I got smart and said I gues you want my credit card info now or maybe my banking numbers.  I told him I knew he was calling from a disconnected number which he denied.  Now im angry, and tell him this is the second call from the same number i had traced online to a disconnected landline and i did not want to see that number on my cell phone again.  Then he offered to get his supervisor. Great! I would LOVE to speak with your supervisor.  I hear some shuffling around and then I'm disconnected.  
I checked out this spoofcard.com site. How easy it is for people to use this service for scams and stalking. Creepy. I'm surprised its legal.