Hey Merv. Do you have a friend who could talk to them on your behalf or can you put the book outside for them with a letter? You have to understand that in their own way these people are using you. I am sure they get brownie points for saying they have a potential convert. I have difficulty saying no but not to people knocking at my door. You are a very caring person. The problem is that some people will use that to gain something for themselves. It's like my ex partner used to Tex me and say he needed sex. I eventually learner that I was under no obligation to help him out.
I don't get refugees here which is good. Can you put a sign on your door saying no traders? If you have been talking to these people for a year a lot of strong no and shutting the door on them will be needed. That vacuum cleaner thing was a bit funny I must admit.