They started calling me and there would be nothing there when I picked up. One day I was off work and pressed '1' and '#' and I started saying "Hello" repeatedly, and then I started asking if they could tell me what time it was, in a weird voice and progressively got more irritated to the point where i was asking if they are 'trying to make a problem' with me - and after that, they finally quit calling. Maybe they thought I was mentally disturbed or disabled, or confused, but it certainly was gratifying. Again, they quit calling me after that, at least for now.