Bear in mind that they have used "shady tactics to make it past the receptionist"; it seems that they're not paying any respect so they shouldn't expect it in kind.

Brilliant! I lasted for three minutes. How I respond to cold callers depends on their approach. I try to be polite with the less obnoxious ones, but I regard unsolicited calls as an invasion of my privacy and they usually interrupt something I am working on. Why should I have to put up with that in my own home?

I like it when the HRV people call, which is a lot, and considering what I do to them, I don't know why they keep calling back. But they do.

I engage the salesperson as much as I can, getting them to repeat things they said 4-5 sentences ago, asking questions, basically keeping them on the phone for as long as possible, generally until I start to get bored, and then I say "Oh, it's like our DVS system then!". You can then hear the sound of either frustration or dejection, sometimes both.

The MOTH just swears at them which is no fun at all. For anybody. 

Heh, funny as. Unfortunately fell down the rabbit hole and ended up with Hello this is Lenny ....

https://www.youtube.com/watch?v=LeOoUklWGiw&list=PLduL71_GKzHHk4hLga0nOGWrXlhl-i_3g&index=2

Is it mere coincidence that I mention DVS here and then voila! there is an ad for it?! Or are darker forces at play?

kiwifidget:

Is it mere coincidence that I mention DVS here and then voila! there is an ad for it?! Or are darker forces at play?