I have started hanging up FIRST, the second they say the word warranty or ask about my vehicle, I just hang up first, that's what they are going to do to you the minute you say no.
I just added them to my call forwarding list. Their calls are sent right to the FBI office in Washington DC. I don't even hear a ring anymore. ;-) I went from 25 TM calls a week to about three. Sometimes I send them directly to Homeland Security or the IRS.
They identified themselves as "NAMBLA", which I Googled. This is a disgusting thing. They asked if I had and young boys that would be interested in making a little extra cash. If you know where this number is calling from, get in touch with me and I will stop it permanently.