There is really no reason to get repeated calls from obnoxious callers.
Very few things in life are really free. If you do not want to pay AT&T,
Simply get a phone number blocking service, app or device. (Some apps are free, in the App Store)
See how other 800notes visitors solved their problems by visiting this site:
http://phonehelp.comuv.com/
(That site also has a link to Amazon's phone blocker devices and apps)