Parcel missing - Reffence number given invalid !

Hi I left a parcel at postnet in Barberton Mpumalanga to be mailed to Capetown/Kuilsrivier. Firstly when I checked up on the parcel the next day ref no given was invalid, secondly nobody knew where my parcel was at. I contacted postnet headoffice in Jhb and they started looking into it, but now they said my parcel is in Jhb at the warehouse but still no ref number on it and when I contacted customer care the lady said my parcel was in Nelspruit so who is lying to me ???.... I am really dissapointed in the service that I received My parcel is still missing and nobody is coming back to me. This wasn't suppose to happen. The guy who helped me at Postnet in Barberton says the driver who picked up the parcels from them never scanned any of the items into the system because he wasn't one of Aramex's drivers . Aramex is the courier service postnet uses to ship parcels.... Can someone please assit me in this matter.