Calls and leaves no message

Calls and leaves computerized voicemail that the IRS is going to open a case against me. Repeats the message and phone number then hangs up. Scam.

Same as Anon above.  Fake IRS collection scam.  Two attempts on my number so far  today.  Their unsophisticated robo calling program starts talking the instant your voicemail outgoing message starts, which means you don't hear the entire scam pitch.  BTW, it's almost impossible to understand anyway because they're using a low quality text-to-speech synthesizer.