FOOLEDNOMORE:
Sorry, but it sounds to me that they are inadvertently being encouraged to keep coming back because SOMEBODY is greeting them and exchanging pleasant conversation.. It might be small talk but it’s just enough to give them ‘hope’. Somebody is making a mistake at your end, I believe.
Regarding your mother and them trying to use her ‘to get everybody in line’ 🙄: I believe you mentioned in another thread that your mother is failing mentally and that she’s not handling her own affairs. I remember when our Dad was failing mentally. (We weren’t Witnesses, but it’s applicable to anybody.) But, he was fast losing it and I remember getting on the other phone extension and telling off a very aggressive girl trying to sell him a car warranty. I told her to Never call again!
While your family’s life is their business.. I could not tolerate nervy behavior on the part of anybody (no matter what company, religion, organization, etc.) who has been repeatedly told Not to call. In my opinion, and if it were MY business: an employee would be instructed to go and open the door and say we’re not interested. No other conversation.
If it were my home: if I saw through the window who it was, I would NOT answer the door nor would I exchange ANY words through the crack. There would be dead silence. Maybe this needs to happen a few times before they realize it’s a lost cause. But, I will repeat: ANY conversation or greeting no matter how short is an encouragement for them to keep calling back!! Any phone calls would also be blocked. No communication.