Suzie, When they ask for you by name, ask who's calling. If it's a call you don't want just say you'll go and get Suzie for them. Gently lay the telephone down on the table and go off and have your dinner. If they are still waiting when you come back half an hour later just tell them, sorry she's not in.

Or, when they start off by saying "and how are you today", I tell 'em. It doesn't even all have to be true.  By the time I've got through my latest doctors appointment for arthritis, migraines, skin condition and irritable bowel syndrome they usually hang up - and I haven't even got to the bunions yet !!!  When they've interupted me and just assume that my time is thiers for the taking, , I'm quite happy to waste thiers.