MTN is *****ing from me!

I took out a My MTNChoice Use Your Own Contract for my son in May 2015 for a R129/month including 100 Anytime minutes per second billing + 200 sms's + 300MB. For May,June, July and August the charges were as follow @ R465.59, R332.93, R299.55 and R 315.65.<br> <br> My first complaint I have logged 29 June then 14 July then 1 August and then 1 September, and only received feedback 2 September, advising me that the additional amounts charged was because I have activated 300Mb data to the account, where in fact I requested them to instate the data and sms's .<br> <br> My concern is that they haven't read any of my mails explaining that I don't receive the data and sms's as per contract agreement, and also they seem to just ignore the fact that they are busy with contract break.<br> <br> I requested mtn to refund me with the additional charges above R129/month and to cancel this contract, with a response that they will charge me penalties to cancel?<br> <br> If any mtn employee with \ability"by chance read this"