NO Upgrade of data for nearly 5 months now

I upgraded my phone on Black Friday 29.11.2019 with an additional deal from MTN through the iPhone store in Centurion. After at least 10 phone calls to the customer service department and mails with new contract and the new deal attached to 10 different persons, NOBODY has yet upgraded my new deal data. I even locked a mail at the ***** division of MTN with no success. Should my next contact be Carte Blanche or the CEO Rob Shuter?