I like to think they put me on an actual do not call list since I tie up and annoy their operators for as long as possible. One time getting the same guy a dozen times before he finally gave up and from what I can guess just went on a long lunch lol.
That doesn't sound like a worthwhile use of time though. What would be cool is if we could transfer the call to a robo responder and have it be smart enough to act like a really dumb person.
It should also learn the caller's speech and slowly overtime change it's own voice to sound more and more like the caller. Eventually the caller would be talking to themself... same accent, cadence, vocabulary, etc. LOL
It's not a lot more effective though.