Pro tip about Mormon missionaries (I've never been a Mormon but have been visited by them): the easiest way to get them to go away permanently is to get on their blacklist; they have them believe it or not. It is basically a "do not visit this house" list. And the easiest way to do that is to try to convert them to a different religion from Mormonism. If you're really good at it, they'll consider you a threat to their missionary work and blacklist you.

Now, you might be thinking "Nah, that sounds too much like work" but consider the benefit: you won't be blacklisted only by Mormon missionary trainer 1 and trainee 2, but no Mormon will ever visit your home ever again, because you are in their LDS ward.