Oh, man, if you're nice to a telemarketer you'll totally notice a sharp decline in calls from them. The asshole may accidentally get dispositioned as "Answering Machine" so that they're called every hour until they say the magic words or someone takes pity on them.

Also, the ones who piss me off make me get picky, seeing as how we aren't required to mark anyone DNC unless they specifically say, "put me on your Do Not Call list." So the idiots who call me names and then say to "stop calling here" tend to get dispositioned as "Call back later repeatedly."

It's those darn computer systems, man. The calls just disposition themselves, sometimes. Honest.