If they are phoning your home number there is little you can do, but of course after answering a call, you are under no obligation to converse. There was a thread a while back where ABers were asked what they do in the event of unwanted phone calls....you should get some ideas by typing in unwanted phone calls into the AB search the site........my favourite was to let them finish there speil and reply........stop messing about, this f....ing body won't shift itself, hurry up and get your a.se round here with the chainsaw......then hang up