Thanks very much for this valuable information. I wish there was a way to stop these people.

Your welcome and  consider maybe getting a call blocking device or phone.. You can google them and many are around $60.00 or so. That will slow them down anyway. But keep in mind, they change numbers so buy one that has a lot of blocking ability and maybe will cover area codes as well.  Also make sure if its email, to block them and/or attach it to a complaint with IC3, the cyber crimes division of the FBI.