Here is a great way to get them to stop calling...invest in a whistle and the next time they call...let er rip!!! Trust me...as a former telemarketer it works! They may call back once or twice thinking they have called a fax
number, but the calls will stop (at least from this number).
The way I handle it is 1) add them as a contact and then 2)set as "all calls to voicemail" .They don't leave a message and it goes right to voice mail. I would block them if I could be phone doesn't have setting for that