Denver (local) number, calls daily and does not leave a message. Caller ID says "Interstate Roofing," but we are on the DNC list... I want to pick up but do not say anything... They usually just hang up. But this time, someone named Walter finally chimed in, asking for my husband. When I said he wasn't here, Walter told me his name and said he'd call back, then hung up immediately. I called the number back, which went to a voicemail box that said it was full. How do you report these guys?? >(