I got a call from this number too about federal treasury conviction. I called but someone hung up on me. I called again let it rang more than 10 times. No voicemail what so ever.
I got the same message and when I called back I asked who I was speaking with. She told me she was IRS Inspector, Rebecca Johnson. Total phishing scam. I reported the call to the US Treasury and FTC per the IRS website. Hope this scam is shut down immediately.