This is an IRS phone call scam. Don't answer it and don't call back. I've done taxes fir 40 years. IRS only contacts you by mail. They never call you on the telephone.
Received two voicemail messages from this number. Because it was voicemail the beginning of the message was not recorded. I only heard it was an urgent case and to contact the phone number listed above. How stupid can these scammers be?!