Welcome to JWN, myusername (aka MUN)!
Usually .... sorry, let me rephrase that... WHEN the Witnesses come to my door ('cause they've been a little lax for years here), I usually tell THEM who THEY are. Then I tell them that my Dad's a JW and I get the magazines from him (this is a key part of my strategy -- they don't leave any magazines). I answer their inane question and then I launch into a personal story of tragedy regarding my JW family members and that pretty much leaves them dying to get off my porch. Hey, maybe that's why they didn't come back.
The WTS and JWs are synonymous with lying. Every single doctrine is a lie. You really can't expect them to behave any differently.