Said they were from Comcast, said they wanted to give me two free years of Cinemax, asked for my name and address, no changes have been made to Comcast account, worried about what they are doing with info.....

Same thing here.....  They already had some basic info. though.

This is the second time this number has called my cell phone and did not leave a voice mail.

just called me... another service said this number does not exist?!
How did it call me then?
Another user on another site wrote: "They said they are from comcast.  I am not sure.  Good possibility they are phishing for information.  Told me about a great deal, asked for the last 4 of my social and yet couldn't pull up my account information.  Called comcast today and no changes had been made to my account, even though I ordered this new service.  Very strange.  

Called them back and have been on hold for over 10 minutes.  They answer that they are comcast and yet it is a totally different message from the real comcast."

number is calling me almost everyday.