Refusal to correct incorrect billing

I signed a cell phone contract with auto page in July 213. As part of my contract I was supposed to receive 1GB of data. This was never activated on my contract. Auto page have since been billing me for all the data used. After numerous queries they finally admitted the problem and activated the 1KB of data in February 2015. In February 2015 I put in complaint for a refund on all the money I paid for data from July 2013 to February 2015. To date I have still not received a response from Auto page. I have made several calls to their customer care department and several visits to their store in the east rand mall. No one can give me response on when I will received my refund. I want a refund on my money and I want to know when will the refund be paid