The thing which really gets me about telesales calls is the power imbalance. The caller, the telesales agent, holds most of the power, in that they have a carefully worded script, along with your name and other personal details, and they’re recording every word you say.

You, on the other hand, have been ambushed — called up out of the blue by a stranger who is trying to sell you something — and you don’t know anything about them. And when you end that call, you have no record of what was said and agreed to, or not...