I ask to speak with a supervisor and I get thier office number and have them send me written confirmation of removal. I also get their names.
The only companies I found that have their own telemarketers is places like Sears, Macy, Wall Street Journal, and the US Energy Dept.
When I signed up for a do not promote list by my state I found a lot of people sign themselves up for it. Like those little vacation info things at the mall or the car give-aways, and such. Some buy the information from creditors which really peeve me.
I actually met once person who said he liked his job. He also said he had a bubbly personality and was extremely rude to me. Then he started asking if my name was greek (but I said it was a wrong number
and never said my name)....
btw, the Highway patrol one is a scam.