Call blocker might be of some help. Also don't pick up on numbers you do not recognize, or where there are caller IDs that seem odd. Or where there is no caller ID. There’s no way to stop the calls from being initiated. Calls originate in India and Pakistan.
Phone ID said call originated from Belleview Washington and when I lifted the receiver the Robo call stated it was a call from the IRS and that they were going to file against me (or something like that) and to call the number provided and they stated the number twice: 425-598-4281. I pressed redial I got a gal (obviously from a call center as you could hear them all chatting in the background) and the gal answered (very politely and very calm) with an East Indian accent stating "IRS". I informed her this was my mother's skilled nursing room that she was just admitted to it and it was impossible for this number to be in trouble with the IRS, She said she would remove the number from the call list. I asked her who were they trying to contact and she said she could not state that information.