Actually I had that phone call the other day too... I cut those cold calls out early though.
Other methods;
- just put the phone on the desk, don't hang up, and let them talk, and talk... they eventually give up.
- engage them is discussions about motorbikes. Ask them if they have one, or which one they would like to buy.... When they try and get back to selling, tell them, "no I want to keep talking about motorbikes". Stay strong on the motorbike topic, and they give up...

- if they ask for a random donation, just tell them that you already donate to The Spastic Centre of NSW, and that all your donation money gone (I actually do donate to them - but they have been renamed).
Sorry to the call centre people out there... You think I waste your time, but you started it by calling me, and wasting my time! You also started it with deciding to get up out of bed, and go into a call centre... you're wasting your own time every day if you do that job!!... get a life, and get a real job!...