I actually like to waste their time by getting them to go through their pitch, standard rebuttals, etc. and then do a "not interested" after all of the tussling...I remember from my telemarketing days the frustration of being strung along...of course if someone did that to me, I was sure to duplicate their contact info and pass it on to all the other rooms and duplicate the duplicates so they were getting 5-6 calls per day per company
can't really do that now wih no-call lists, etc. and I'd imagine the margins in the phone sales game aren't what they used to be...especially cold calls...