Im a Federal CS Retired/CSRS, who falls in the guidelines of the Bailey decision (I have 7 yrs prior to date of 1989).NC tax stated I have to file form for 2013.True??

Im Exempt from FedTax due being Disabled FF/EMT &reaching age that I would have retired full service. What concerns me is NC Rev. Just wants 2013 tax form regardless of exemption.Is it required to File every year regardless of exemption?NCRev. Stated they didn't know! Confused. I requested answer in writing,but they disregard and phone stating their requirements. Sounds Fishy.