One of those stupidly abusive callers who yells at you because you don't want them to clean your chimney. I think that these company reps believe they can intimidate their way into your house and wallet.
I gave up on the DNC list. I sent a transcript of the lovely conversation to the state attorney general's office.
When I asked for my number to be put on their do-not-call list, caller (who sounds like a recent parolee) says "ok, have it your way, I'm just gonna call you again, then again, and again".