Poor Customer Service

I have for weeks now tried to get a satisfactory response regarding the termination of my 1GB data contract, which I want permanently cancelled when it reaches it termination date of 11/05/2015.<br> <br> For months now my account has been correct until I received my statement for Feb 2015. The invoice for Feb 2015 (Inv # E***) is incorrect as MTN have not credited this invoice with the SMS Bundle as it has been doing for the past 6 months. Please check the previous months invoices (E***, etc ...) for this phone number and pass the necessary credit. It really isn't that difficult to correct your mistake!!!<br> <br> To phone the call centre is a joke. Either nobody answers or nobody can assist. Emailing also does not seem to work as all emails are ignored!!!<br> <br> I'm now also tempted to cancel my 2GB data contract due to poor customer service. Followed by both other cell phone contracts I have on this account.<br> <br> Why do I have to air my grievances here in order to get a response from MTN???