Not receiving data as per contract terms

I am running out of avenues to try and resolve this matter. I recently upgraded and with my contract I am supposed to receive 42GB data per month, however I was only credited 12GB data. I contacted the call center on 27 February and was assured that the matter would be escalated to the accounts department. Again I contacted the call center on 6 March to receive progress and was told that I have to be patient. When I contacted the call center yesterday I was told that the ticket has been closed but the call center agent reopened the ticket and escalated again. No feedback is given and still the correct amount of data has not yet been issued to me. I do not think it fair practice in terms of the CPA that I am paying for a service as set out in my signed contract but not receiving it as I believe this to be a breach of contract on the part of MTN. As I am not getting any joy out of the call center or by PM on Facebook, I am getting severely frustrated to the point where I feel it is necessary to request from the Consumer Protection Ombudsman to intervene.