They said IRF F as in Frank. I called repeatedly as they've done to me. They blocked my number so, I changed my caller ID readout and called more. I doubt they'll bother me again.
These people called me and said I owed the IRS the same, $1998.32. Told me all my possessions/bank accounts/credit cards/driver's license would be seized in one hour. Almost got me!
Just got the same call, said I owed the IRS1900.00 and that two certified letters had been sent in the past . They were demanding their money ( I knew it was a scam ) got a friend in DA'S office to call them . The guy was foreign bet he won't be calling anymore. Was able to pinpoint exact location !!