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 and they spoof local numbers.
Got two calls from this number today. First time it came up caller ID said it was from Romania and gave +40 49347046 as the number.Left partial message both times saying I was being sued by IRS. Did not call back
called two times on 12-2-15. Heard message and didn't answer. Had received previous calls and knew it was a scam. Also don't answer if someone says they are calling from Microsoft!!!