Worst Upgrade with MTN

I have been an MTN client for many years but this year has been the worst experience after many years of MTN getting all kinds of billing wrong. I app**** for an upgrade of my account on 29-Nov-22, this was initially done online, but then I received a call from a Mondo agent to faciliate the upgrade. All details were provided and I was assured I would get an email immediately after, To date,I dont have an order number, or any email. I have called MTN on 083135 over 10 times. MTN agents keeping saying they are going to transfer me to customer care , but they keep cutting the call. This is the worst service ever. Every agent just says, it is approved and then nothing else. Again this evening on the 19-Dec-22 I spoke to an MTN agent, they said to hold on for customer services and the call was cut. Is there anyone that can finalize this upgrade, and stop wasting my time. Or cancel it and allow me to move to a better provider that can carry out a simple upgrade. I am fed up of talking to agents - USELESS