If thats how you feel aussienic, you need to either ring your local Kingdom Hall of Jehovah's Witnesses, or wait until someone comes to your door again, and tell them you would like to be on their 'Do Not Call' list. From then on, you will get an annual visit to check that you still would like to be left alone
So, how do you get out of the annual visit, without being rude?

I think some churches who do door to door are just working on people who do not want to be rude, and the weak and vulnerable who are unable to say no.

I would not want to 'convert' someone through pressure (and i see even an annual visit as pressure), because i would question the reason's for a person's conversion.