Happened again. *Knock knock*
'Hi, I'm from -'
'Really busy thanks.'
'This won't take a mom -'
'Ahh, no worries then. Give us your name and home address -'
'Oh, we don't -'
'Give us your name and home address and I'll drop in randomly in the next six months to discuss whatever this is.'
'We don't ... Oh.'
Works every time.