options: hear the knock on door or bell.....go to door....do not open it.....and announce "NOBODY HOME". walk away and see how long it takes them to get the message. warning - be prepared for some more door banging, depending on how hell-bent they are at getting at you...............
option: open door an inch or so, smile sweetly and say in your most sugary voice "I'm so sorry - I don't have any time for idle chit-chat today." Close door.
option: ignore the banging at the door......swear silently all the invectives that make you feel at peace, and know that they'll disappear in a bit.....