My present home phone has just failed and I bought the BT8500 Advance Call Blocker Phone. Absolutely brilliant no nuisance calls whatsoever and no lost calls that you need to receive. Cannot praise it too highly.
As bumpkin says "Just put the phone down" - how hard is that?
When you receive the same call from the same people who utterly refuse to accept that you're not interested and you put the phone down on them, you tell them to go away and you repeatedly tell them again and again that you know it's a scam and your patience is driven to the absolute limit by up to ten of these phone calls per week for a month or so. Yes, maybe I'm not as saintly as you, matey. God bless you.