Unhappy with service

Good day. I want to start off with my worst experience ever!! The 29 May 2018 I registered a letter to go out to Johannesburg post office. 04 June I phoned Pretoria Silverton post office where I registered the letter, The manager Cobus informed me that it's supposed to go to Johannesburg. 11/06/18 I phoned again the manager told me it's in Johannesburg but they didn't check the envelope in. Week after week I phoned, get the same report. I even asked for JHB'S contact number then they ask me where in JHB? I spoke to a lady last week and I got no help, even the manager don't want to phone and find out what happened. I asked him and he said that they don't pick up the phone ( did he really phoned them??) That's he's reply every time I ask a number or help. This envelope contains original paperwork for Department of Education, they don't take copies, (my child needs to be registered by them for Home schooling) they tried as well. It's a brown envelope with BIG BLACK details on for The Director of Department of Education, Box 7710 JHB. You can't miss it. We all wait for the envelope, they try to find it and me this cost me now almost R200. Only to find the Big brown envelope written on with black permanent marker. Please the post office need to wake up they cost me money. They have to find it and if they lost it I will be forced to do all of those work over BUT they are paying for a courier service (not belonging to them I don't trust them anymore) to pick it up at my address and deliver it door to door. The contact details for Silverton post office is ********** 432. Thank you for your time and help. Hope to hear from you soon. Greetings Hanthea