Received a message from this number today. To my ear it sounds like a scam.

"Unfortunate action"  "ignoring this message represents an intentional  second attempt  to ignore appearing before a federal grand jury. " "We''d like us to help you."

Most likely an Indian or Pakistani IRS or debt scam.  Block and ignore the calls.  IRS does NOT initiate contacts by phone.

Total clap trap.  If you were the target of a grand jury investigation, you'd be notified on a face to face basis  and by mail from members of law enforcement.  You'd have the right to appear (without an attorney) during the GJ proceedings.  In any event you would NOT be notified of a GJ proceedings by a phone call out of the blue. Ignore and block these calls.  No one in the US is prosecuted for ordinary errors in tax returns.d

Got the same message that Jane got from this number scam all the way!!