Call went to answering machine; she states she is the IRS and I will be sued if I don't call back immediately! Left 908-306-9423 #. Internet shows this number belonging to a NJ person?

Number is spoofed.  Ignore and block the calls.  Standard IRS scam originating in India and Pakistan.  IRS does NOT file lawsuits and does NOT make initial contact by phone.  US mail only.  Common scam.