Robo voice message claims to be the IRS - leaves this number for callback but caller ID picked up call coming in from 800-829-0433 clearly this is fraud
There's no way to stop the calls from being initiated. Invest in a call blocker and DO NOT pick up on call numbers you do not recognize. Might be a good idea to block the entire 202 area code. IRS does NOT initiate contact by phone. US mail only.