I put them in a block list last winter and the calls stopped. Took them out to make room for others numbers to block and they have started calling again. They are back in the block list. The only way to stop them is a phone with a Block List option (Panasonic makes one.) Since they call with an ID and call between 8:00AM and 9:00PM they are legal, even to people in the "Do not call list". Either don't answer, block their calls or offer them $1,000,000 with some made up credit card number (i.e. annoy them.)