Cell C *****ing my data

I upgraded to a new contract on the 18th of Aug. I received my usual, old contract, data of 2,2Gb. On the 18th the new contract was activated and data was added to my previous contract data. 3 days later on the 21st all my data disappeared. I called customer care that explained what happened. I was told the old contract data was only available till the 18th and that I only received half of my new contract data on the 18th. But that I would pay the amount of my old contract without receiving the data I am paying for. The consultant gave no solution and only said sorry and that the agent should've explained it to me. Now I have to pay full for have the data and because Cell C didn't explain how it works. I am on my way to stop the debit order and paying them a cent until I have the data I've paid for!!!!!!