Paying more for something I did not ask for.

When I signed my contract with MTN last year in July, it was on an MTN My Choice 100 contract which meant that I received 100 minutes, smses and 100 MB of data every month. When the consultant who helped me with my upgrade asked me if I wanted an open account (which means that if I run out of said minutes, smses and data that I will be charged extra for what I then use over and above those I'm given) or a closed one which meant that if I run out of those minutes, data and smses I can just recharge like a normal Top Up/Prepaid scenario. I opted for the latter, the closed account. Fast forward to the bill I received today 17/04/2015 and I see to my shock that I owe R200 over what my monthly bill is. When calling the call centre the operator tells me that my account is an open one and so I have been charged for the extra data/minutes/smses I used in the last month. So imagine my surprise at being told my account is open and not the closed one I specifically asked for. This is utterly unacceptable, not one month since I have taken out my contract has my bill been correct. Every month it's something new. So MTN can be assured I will not be renewing my contract with them next year.