Bring back my data

On the 19th of December,I bought a 15mb data Extenda. I was anticipating that the data I had would expire on the 30th of December and therefore wanted to carry it over to the next month.On the 30th of December, my data did not extend to the new month.I had about 22 GIGABYTES left.I called the call centre and was referred to Lance Chauke who is a teamleader. He said because it bought the 100 GIGIBYTES promotion, that data does not apply to the data extenda. I told him I went through the terms and conditions and nowhere does it say that. He escalated the matter to back office and gave me the ***. After numerous attempts, I managed to speak to Lance Chauke again on the 12th of January.I our lengthily call he apologised and assured me I will get my 22gigs of data.The next day I called again to speak to Mr Chauke, he was not available but managed to call back around 8pm.The matter took a right about turn when he informed me that I will not be getting the data. Most importantly,Mr Chauke in his capacity as a CellC representative gave me assurance on the 12th that this matter will be resolved and I will have my data loaded.I told him to listen to the call.