Poor Customer Service

Upgraded my contract at the MTN store in Sandton City in May 2022. At the time there was a promotion that would allocate 20gigs of data as part of contract however have not recieved the data since. I have called the contact center and the store itself numerous times without any resolve. At some point I went into the store and was promised that the manager would resolve the issue but nothing has been done. Tickets logged by the Contact Centre have been closed without anyone getting back to me on what the outcome was. Very disappointed in the poor service.