Worst customer service in the industry

So I have been with MTN for around 5 years now and I have always been happy with the service I received but your customer service I have experienced from this year has been absolutely ridiculous.

Amongst many other things my latest experience was I was due for an upgrade so I went to upgrade my contract I already have the new phone and have upgraded however I get called like 3 times a day from your call center to tell me I am due for an upgrade and I have explained many times already I have already upgraded.

The latest advisor I spoke to told me that if that is the case then the agent that upgraded me never finalized the process so I must go into an MTN store and get the agent to finalize the process otherwise it could become and issue for me in the future.

How is it my responsibility to go and fix an error from your side?? Before doing my upgrade I was seriously contemplating leaving MTN after the 5 years I have been with them and now I seriously wish I did because the service I have received is shocking.

If MTN even has a customer service department which I highly doubt they do, it would be great if someone could contact me as now I am stuck with you for another 2 years and have no choice.