Have received many calls from this organization, have blocked many numbers (often they call back dozens of times on blocked numbers), and have asked them to stop calling--after which they've called even more...  Neither we nor anyone we know has ever had anything to do with them (or ever will), and neither we nor anyone we know gave them our phone number.  So we ignore their junk calls, junk mail, and junk visits to our house, and will continue to do so forever.