We've been through it all with them too and are registered on the Do Not Call list. According to the FTC, whether you have a business connection with an 800 number or not, if there is a pattern of abusive calling, they can get slammed for up to $11,000.00 per incident. But you've got to be registered on the Do Not Call list and file a complaint either online or by phone to the FTC each and every time they call you. From there, the FTC builds up a database on whoever it is and fines them. DO IT, IT'S THE ONLY WAY.