My new favorite thing to do is to tell these car warranty phone calls that I have a 2007 Tacoma with 140k miles on it. Let them go through the entire thing, quoting prices and explaining everything. Usually you go through about 4 people before you get to the guy that takes payments.
When I get to that part, and they ask for a credit or debit card. I tell them I can only pay in cash because I primarily use the truck to smuggle cocaine across the mexican border and I would like to just pay in full.
Tired of asking to be taken off the list so I've now resorted to wasting as much of their time as I possibly can.