You cannot complain about the service as non exist for MTN

I have upgraded on the 30/11/2019 to XS with a Sony experia X10 plus phone with memory card and sound bar. Three days later I received a delivery from the company. However on receipt the package was opened and the sound bar and memory card was not included in the package. I did not except the package. I contacted MTN immediately. Ever since now 35 days later I had promises of people that will phone me or sent me detail via email. I have spoken to Tabanh, William Meintjies, Porsha. Even Angela Manne on the complaints email died a death just after my first response. I was requested to phone ***, ***, ***, ***. One consultant even gave the number ***. Do yourself a favour and phone this number. Every one direct you to the next number or next person. It is absolutely no ones responsibility to sort out this mess. I was billed already for a devise which I have not received up to date. Is there any competent person who can be contacted?