The scammers won't stop. You have to stop their calls getting through to your home phone.
Have a look at a trueCall screening device or one of the BT phone ranges with trueCall features built in.
This screens the calls by requiring the caller to say who they are and press a key to continue. The automated scam diallers can't do this so the scam call never rings through to the home phone.
I no longer have a landline but, when I used this on my landline for about 18 months, it stopped the scam calls entirely.
In the meantime, don't speak to the scammers at all when they call. Just hang up without speaking. When you answer, it confirms the line is working and someone on the end of the line is willing to talk to them. They will keep ringing in the hope that someone will answer who will be taken in by their scammer stories and fall victim to the scam.