Follow Nelly136's advice. It will work for a few years and then you will have to probably do it again. You can also be as polite as you like in a letter without resorting to their low standards of social niceties.
You can either hand the note to the lady or put it in the Kingdom Hall letterbox. You should put it in an envelope addressed to the Elders.
Religion n.
An organisation designed to promote atheism.