> but they seem to have dozens if not hundreds of phone numbers they’re using from all different area codes They don't have hundreds of numbers they are callin

> but they seem to have dozens if not hundreds of phone numbers they’re using from all different area codes They don't have hundreds of numbers they are calling from. Those numbers you see are all fake. Caller-ID is trivial to fake, as it basically (before shaken/stir finally get deployed) is just passing along to your phone a value defined by the scammer. As far as how to stop, you can't. The best you can do is what you've done. Adjust phone settings so that only caller ID's found in your phonebook ring through. That will mean most of the fakes don't ring your phone (although they will junk up your voicemail). But should the scammer happen to randomly pick a number that is already in your phonebook, their call will ring through.