MTN Repair Centre - Poor turnaround time

I submitted my iPhone X on the 9 July 2019 (which was still under warranty) to the MTN Constantia Service Centre. They in turn sent my phone unit to the Johannesburg MTN Repair Centre for attention. After a protracted period of three weeks with no response, I contacted the MTN Service Centre in Constantia who indicated that there was a backlog in dealing with repairs. I finally received confirmation from MTN early last week that the phone would be replaced with a new replacement unit. This unit would have been sent through to the Service Centre I was dealing with for my collection. To date and over a week later, the Service Centre in question cannot confirm when and if the new phone unit will be arriving. It looks inevitable that I will have to wait for a further week (at least) before I have a phone service (all the while, I maintain paying for a service which I am not fully getting value from). It remains a simple process of shipping a replacement unit to the Service Centre or the Service Centre just issuing me with an in-stock replacement unit ; yet this is not happening. I hold 3 active family contracts with MTN yet it is mind-blowing what MTN seems to think of my business and have done very little in attempting to ensure that I have at least continuity of service. This absolutely a poor showing will weigh heavily in my decision to ultimately renew my multiple phone contracts with MTN in future.