I haven't found a way to block them completely, but I did save their number as "spammer" and set the ringtone for them to 'none' on my cell. Now when they call I'm not bothered, because my phone doesn't ring.
Name appeared as Lisa Skoglund with the phone # of: 906-221-2705
I asked who they were, and what they were calling about. They would not say.
I told them to stop calling here, they person was rude and said they would call again as
many times as they wanted to.