North Carolina does not have any sort of "sealing" provision in the law. It sounds as if your petition for expunction was properly denied because you were convicted of that crime and placed on probation. Unfortunately there is not any other relief available to you to remove this from your record except perhaps a formal pardon from the Governor, which is unlikely.
No answer to these questions is intended to, nor does it, create an attorney-client relationship. There is no substitute for an actual conversation with a licensed attorney about the particular facts and circumstances of your case.