Have some fun with them, like "Jolly Roger" did:
. . . I figured I’d try something. I was getting a lot of repeat calls from numbers. Obviously the same company’s predictive dialers were calling me at various times trying to find me home. I thought, what if I play a sound file that says “hello?… Hello?… Hello?…” a few times? Would it fool their predictive dialer into thinking it had reached a real person? So recorded some “hellos”, then “hang on a sec”, and then some silence. I created a “parrot” routine and sent these obvious telemarketers to this parrot.
And it worked like a champ! So then I thought “hmmmmm, how far can I take this parrot?”Very far, it turns out. Read the rest here. "Roger" is my nominee for man of the year.