MTN unprofessional service

I am very frustrated, the unprofessional service received over a number of weeks is really concerning. I was due for an upgrade in September and was told that I could only take a new contract for half of what my old contract was( with several different reasons as to why). I then refused and asked for my contract to be cancelled which I was told they will get my credit back to the original amount of my contract. That did not happen It's almost 2 months and they are giving me a different story each time I want to cancel my contract. And this is all after going into Clearwater mall, Cresta, online and by telephone . The staff speak to you like they met you in a bar seems like they all well trained to give people a run around

Today I call 135 and was told that they would call back me in an hour, 5 hours later no luck.

if you call the 135 to upgrade they answer your call in less than 3 min. Call to cancel your contract you wait for 46 min.