How do i switch off quick replies for good!

I switch toggle off and annoyingly when i check again later, its switched itself back on. I do not want to keep apologising to my callers for an annoying message coming over our conversation 30 seconds after I have already opened my door!!!! Its so annoying!  I do not want quick replies full stop. How do i get rid of it. Not only that its an American accent and I live in the UK!!!!