There's no way to prevent the calls from being initiated. Invest in a call blocker an DO NOT pick up on numbers you do not recognize. Common IRS scam. Originates in India and Pakistan.
This number has left me two voicemails today claiming they are from the IRS and they have issued a warrant for my arrest. However, when they call me, the number on the caller ID comes up as calling from Japan. Then the voicemail number is the 814-436-3746 number...? Strange?? It is also a computerized message and when I tried to call the number back, they hung up on me. How can I make these calls stop???