Operators are useless

On 3 february I called and spoke to a lady named granny to apply for a new contract. We did the process on the phone and was told i will be notified within a day or two on the outcome thereof. I never heard back from mtn. I called again on 4 feb. I was told to wait another day. On 5 feb i called again then was told to call later. I called again same day and explained to the operator i want to change the contract from a mychoice100 to a flexi200 as it is the same price. I was told they cannot assist and only granny can assist as she initiated the contract. I was promised once again she will call me. Much later in the day i called again and asked specifically to speak to granny. No joy. Called again later and again i couldnt speak to her. The 5th time i called i spoke to a gentleman and explained the situation to him, but got no luck to resolve the matter. I called again on the 10th and the 11th and each time the same story. They all tell me they cant assist and only granny can assist. Its rediculous that i have called 9 times already and still cant get a resolution to this. I even asked to cancel but again only granny can do this. Pathetic service. Still awaiting correspondence