Bad service of a missing parcel

I just don't even know where to start, Aramex lost my parcel. When I called their call center I was told that the last update was the 26th August and their Johannesburg depot until today its still there, no progress or what so ever. I ve been talking to a lady by the name of Lee on this number *** how ever she doesn't even give me an update since she said their investigating the matter, am the one who calls in every time requesting an update she doesn't give me feedback on my missing parcel. I just want the matter to be investigated how can a parcel go missing after it was collected from the sender on the 26th of August 2020. Tracking number is Bdp***.