Maybe one way around this is something we use in the family, seems to work, a code symbol is made within our name. when it is there it is ours if not it maybe spam or a typo but it goes in the delete file and is cleared from the machine sometimes immediately. And my sons say never to put them on block out as this gives them a valid address. Seems they have some type of tracking equipment. One don did say on the phone problems , if you can do it before they answer tapping the pound key several time screws up their computer and erases your number. But I wonder how many thousand call centers are in this world.?? Bud.