Finally decided to start taking note of these, not the cold callers as they seemingly use dozens of numbers, but the companies who are using them for lead generation. I accepted "Christine"'s offer and within moments had a call from Alan at Alliance Security (Texas number) - finally a real person. Told Alan to take me off their list and if I had another call that led me to Alliance I'd be filing a complaint with the FCC against them as they're obviously using the spammy service.
One of many calls from a company called "Home Protection" that promises to put me on their "Do not call" list. When I asked for a contact number, Calvin disconnected.