I think the person using this number may be an independent telemarketer. He promised a "better deal" than I was getting from Time Warner Cable. I asked him to send me details of the "better deal" in writing; he replied that he could only offer it verbally. I said that I could not consider any "deals" that were not in a written contract.
FYI, he was not discourteous, and seemed to be following his script. I have blocked the number (thank you PhoneTray), so won't be bothered by calls from this number any more.
I got the same call about 2 minutes ago. The lady on the other end of the line seemed to be talking while standing in a wind tunnel, so I said I was sorry, I can't hear you and hung up. She was babbleing something about Time Warner Cable and knew what products I was using.