Robocalls are a robust business and they're almost always a scam, according to the Federal Trade Commission. Engaging the robocallers is a mistake, says FTC staff attorney Ken Abbe. It can even trigger more calls, because it tells the company there’s a human on the other end of the line. "Hang up don’t push 1, don’t call a number in the robocall, all that’s going to do is connect you to a scam artist," Abbe told NBC Bay Area. “Virtually every robocall has been illegal since September 2009, so chances are if you get a robocall from a telemarketer, it’s a scam.” The FTC receives about one million complaints a month about telemarketing robocalls.