PATHETIC SA POST OFFICE

I was sent a parcel with tracking number RC ********** 04ZA. When I was checking the tracking it was in transit from PE from the 10th of August. When I called PE where it was sent from they directed me to the central office and gave me a number. I called the number the guy tells me that it was sent to Johannesburg Witpos it is probably already there but the box hasn't been opened. So I really need this document by today, I asked if I could go there and they could look for it. He could not tell me what to do except to wait for maybe 2 months. He gave me the number of a person at Witpos I called from 15:30 until 16:00 no answer. This letter was registered so it could be tracked until it got to me within a required space of time. What do I do now? Please dont use the post office