Dang, I guess I'm just fed up with JWdom. I just don't believe in giving them even the slightest impression that they have any kind of power/control over you whatsoever or that you answer to them in any way.
I would just give them a brief, firm "no" and walk away as if they don't even matter to you. Leave them in the dust. They only have the power over you that give/allow them. You (we) do not have to cower to them or answer to them or in any way add to their delusion that they're in a high place and we're in a low place in need of them to lift us out with their strong arms.
Over the last year or two, they've stopped by my place when I wasn't home and left tracts and notes in my door. A CO that I don't know came one time. I can imagine that they think if they catch me they're going to find somebody who's kind of like "Oh, hey brothers, I'm so glad you stopped by. Yeah, I need to get back to the meetings" [in a lowly tone with my head hanging low]. Believe me, it ain't gonna be like that.