I haven't tried that yet, I normally try keep them on the line for as long as I can, like the lady that called me last year about extended warranty plans for my previous car. I let her go and on about the warranty, costs, cover, etc. and only after around 5 minutes when she asked if I was interested did I let her know that it would be a complete waste of money since I had a full maintenance plan on the car so I only paid for fuel and tyres

They very rarely ask if I am interested initially, they ask if I have a few minutes to listen to their sales pitch, so I oblige.