Suspicious promotional phone calls

Has anybody in the past few days received phone calls from someone who claims to be working for DirecTV and offering a promotion of cutting your bill by more than a half while giving you every option that DirecTV offers if you prepay for 6 months over the phone? He has called once yesterday and once today. He seems to only have a little bit of my information but knows my phone number and which directv package we have. The moment I questioned it he hung up. When I call back it says it's DirecTV but it sounds completely different then when I call the customer service number. Different voice different options everything is different. I did a Google search of the phone number and it is coming back as a private home valued at $163,000 in Monterey Virginia.
I have tried to call the main customer service number to verify for 2 days but cannot get through.