As a former telemarketer, I wish people would use some of these!
I mean, if you're going to be rude to 'em, at least be creative! Everyone always tried the same stuff: putting the phone next to the radio, faking their own death, or my favorite, answering the phone, confirming their name, then switching to a fake Mexican accent and claiming that "They no live here...no English".
It's these kind of things that actually made the job tolerable, believe it or not.
Just be aware, that most telemarkers will retaliate. Usually just something as simple as changing your name in the records to Pat McGroin and putting you on the foreign language callback list, but sometimes they can get pretty creative.