Incompetence and struggling to take out phone contract with MTN

Most terrible service in the world!!! I took out an additional contract on my name on Friday afternoon 24 February at around 15:00. The number on which I took out the contract is still on prepaid.

Here is the full background on 13 February at 17:00 I took out a voice only contract on my name for my son for R100 per month. I discovered that I made a mistake and that I should have taken out a data and voice contract for R135 per month. I was back in the MTN store Secunda the very next day at 08:00 14 February. I was told that the R100 contract will be cancelled without any issues as it is still within 7 days and in anyway it is to MTNs benefit as would be taking out a more expensive contract anyway. When I took out the contract I automatically had to buy a R150 sim card which was expected as I needed a new number. After I cancelled that R100 per month voice contract on the 14th I waited around 3 days for the contract to be cancelled without any success. That is when I tried to call the number that was allocated to me on my sim card and I discovered that the number given to me was given to somebody else as well!!. So I went back to the Secunda store a third time and they admitted they made a mistake and that they should not have allocated my telephone number to somebody else. So I waited another few days until the 24th of February where I was told the issue had been resolved and they gave me a new number but then I was still on the R100 per month contract only with a newly allocated number.

So this was the 4th time I had to go back to the store. The R100 contract was cancelled again and the R135 a month contract was taken out again with my newly allocated number. So I was told that my number (still prepaid) will be added to my contract either that same afternoon the 24th or at the latest Saturday the 25th.

Well it is already the 28th of February and my number is still on prepaid. Honestly the way I feel now I do not longer want to do business with MTN.

How difficult must it be to take out a contract with MTN.