Nuisance Calls? - Jail 'em!

http://www.yorkshirepost.co.uk/news/opinion/greg-wright-jail-threat-will-make-nuisance-callers-hang-up-1-8106391
They always manage to ring during my essential afternoon nap. I suffer badly from insomnia and an uninterrupted nap is essential for me to be able to function adequately.
(I think that these are the only people to whom I am ever rude.)
My better alternative - if I'm up to it, that is - is to thank them for calling and explain that I want to talk to them about their need for personal salvation.