South African Post Office is the worst in the world

I posted some legal documents to the US from the South African Post office on the 18 of January 2019. The parcel is now missing, it's the 4th of April. I completed an enquiry form on the 15th of March and handed it in at the La Lucia branch. I haven't heard anything back and when I try to call the customer nr I cant get anyone on the line.

Then I went back to the La Lucia branch and got a landline nr. I was emailed and told they never received the enquiry send by La Lucia Post Office.

These are extremely important legal documents and this is now a critical situation as no one can tell me where my parcel it. I would like to file a complaint as to the service of tracking with this parcel has been really slow and unhelpful, but the complaint email address is the same as the one that I don't get any response from.

The only email correspondence I have had so far is from one person and then it stopped. How can I get the attention of the right person. This is an urgent matter. I need to get a refund for my contents or return it to me so I can use another service to post it with. I called today 5/4/2019 and the person at the call centre told me that he cant help me at all. There is nothing worse then calling the support centre and the person tells you, I cant do anything for you.