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.

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.

returned call to disconnected number

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