I am fed up!!!!

I have since been waiting for mtn to cancel my contract, no one has called me since a month ago when they told me someone would call and assist since they say we not allowed to speak to those people anymore. I am really done with mtn, by the end of the week i want this contract cancelled because i will not waste my money anymore buying data that will fly in 5 seconds. how does 850 MB's get consumed in a day over stupid applications that do not consume that much data? (i.e watsap, twitter)<br> if no one answers me in 2 days im reporting the matter to ICASA!!!!