TPS is useless these days
The phone preference service list was great when it first came out and reduced my calls drastically, plus callers would instantly apologise and drop the call as soon as I said I was on it.
Nowadays though, assuming it's not scammy overseas calls who just don't care or automated messages with an American drawl telling me I've won a holiday, I'm plagued by callers who claim to be exempt.
I don't get sales calls any more, I just get a constant succession of either surveys (apparently they are not covered by TPS - at least according to one stroppy woman who interrupted me saying politely that I was on the TPS list by saying it wasn't a sales call, it was a survey to see if I'd heard of their product and that I was obliged to take her call) or firms trying to get me to invite them round to quote for loft insulation by pretending to be from a government agency (I know there are grants, but I'm pretty sure the government doesn't phone me up 5 times a week to tell me about them). Did have some fun with one of those though - she asked if I could see the top of the joists under my current insulation so asked her to hold while I went and found a ladder, and she did.
Unless the caller is rude, I try to be polite when dealing with them - they're only doing a pretty stressful minimum wage job at the end of the day, but I do wonder about some of them. If I was having to do this job to make ends meet and I called someone who clearly was not interested, I would end the call and move to the next one. I certainly wouldn't spend my time arguing with them and telling them they are wrong or stupid for not rushing to take up their fantastic opportunity. Do they honestly think I'm going to see the light and change my mind?