I keep getting calls as well, guy with an accent trying to sell "flat-rates for my electricity" told him I wasn't interested and now when I answer he hangs up! I'm sure it's a scam and I'm curious why he keeps calling even after I declined his services.
An Indian guy called me from this number, calling himself by an American-sounding name. I believe he said that his last name was Smith. Yeah, right! I brushed him off but he insisted that he would call back. I have instructed everyone at home to ignore any numbers that they do not recognize. I have also reported this company (Frontier) to the Do Not Call Registry.