I have been getting daily calls from this number for nearly a week now.  I work from home and screen calls, and I do not pick up the phone unless I recognize the number.  They NEVER leave a message, but it is getting increasingly annoying.  On the caller ID, it says "Service Provider"

I got a call to day from 520-844-0205.  I picked up the phone and all I heard was a very loud annouing buzzing sound. No one talked. I hung up.
It was not a Fax Machine.

Caller uses profanity when I ask to be removed from the list.  Have reported them twice in DoNotCall complaint system.  They have told me my name and mailing address and say they know who I am.

if you get a call from this number call the fbi immediatley

Answer the phone and no response then someone hangs up.