Mr. Knoetze:
I am quite perplexed about why the South African civil aviation regulator cannot provide you with the information you are seeking - that being the record of the last moments of the flight that has been recovered from the flight data recorder.
Under ICAO Annex 13, which governs aircraft accident investigations, the state of registry of the aircraft has the right to participate in an aircraft accident investigation that involves an aircraft on its register. Normally, the state in which the accident takes place will take the leadership role in such an investigation, but it is not unheard of for another interested party - such as the state of registration of the aircraft involved - to offer to take the leadership role, especially if the country in which the accident occurs has limited resources or limited expertise.
I made several posts on
page 4 of this discussion that specifically addressed the legal and moral responsibility of the South African CAA in this accident. Like you, I am very disheartened to see that the South African CAA does not appear to be doing everything they can to bring full transparency to this investigation, and to learn lessons from it that can be used to prevent similar accidents in the future.
Based on what we have seen so far, it appears that the South African CAA takes an "out of sight, out of mind" approach to their responsibilities to provide operational supervision and oversight to aircraft registered in South Africa when those aircraft are operating abroad.