You appear to be stating that you performed 144 community service hours under an authorization that apparently expired, and an additional 146 hours after the authorization expired. You can document that you performed the hours, and they were with a court-approved organization, but the probation department is stating that they cannot credit the hours due to the expired paperwork.

If you cannot resolve the issue within the probation department, such as by appealing to a supervisor, then you would need to bring a motion before the trial court. If it comes to bringing a motion in court, I suggest working with a criminal defense lawyer.