The female computerized voice claimed to be from the IRS telling us this was our final warning before being sued by the IRS. It gave me a phone number to call
I got exactly the same message as you described, I called back that # but reply was that phone # is not in service. I don't know what this lady was trying to do. I know it is a scam.
Just got a call from 607-722-9687, their claim was: This call is from IRS, Internal Revenue Service, we are getting ready to sue you. Call ?02-864-1351 to resolve this issue.