MTN poor service delivery

I app**** for an early upgrade on my MTN contract. The first store in Bloemfontein stated that there is a problem to capture the Samsung A 51 on the MTN Made for me S 2GB with a three months payment holiday. I went to another store in Bloemfontein and app**** there for an early upgrade. I was informed that there was a problem with my credit vetting and escalated the request. The next day I went back to the store only to be informed that they had the same problem as the first store and escalated the application. The third day I went back to the second store to once again be informed that the problem is now my credit vetting because I am under debt review. I have upgraded twice since my debt review. I submitted a complaint to the customer care and just receive an email that I will be contacted. No response received from them up to date.