Billed for data not received & poor customer serv

I called on 14 & 27 January 2015 to report on data not received to the cellphone number linked to my account. I've been billed for data not received for December 2014 and January 2015. I received no response from MTN. Only after a strong worded e-mail (2/2/15) to customer service my account was credited (9/2/15). No apology was offered for the inconvenience caused due to a fault on their part consequently I sent a return e-mail (9/2/15) to express my dissatisfaction in their service and only then an apology was offered. On 2/4/15 I'm faced with the same problem, I'm billed for data not received for February & March 2015. It is clear that the account has not been updated with the correct information in order for my billing to be correct. I've sent an e-mail to customer service to lodge another query which will (as I suspect) take another month to resolve. Although I am currently keeping up the terms of my contract with MTN, MTN has failed me with their poor service delivery and customer care.<br> The MTN reference numbers below refers:<br> ***, *** & ***<br> From an unhappy customer<br>