Cell C won't do anything about double data billing

Using the Cell C self help service I bought 3gb of data, before I got a confirmation that the data had been purchased I received an error as I have recieved many times before. As usual I just restarted the process. This was on the 29th of September.<br> <br> When I noticed that I had received double the Data and had been charged for both bundles I phoned cell c and was told that there was nothing they could do because I used the self help service and to send an email to customer service. This was on the 9th. I requested a refund or a extension on when the data expires<br> <br> Some days had passed and I phoned to query on the call and I was told the they will get the person responsible to phone me back within 3 working days. A new call was opened.<br> <br> On the 4th of November when I had already been charged and and the data had expired someone came back to me. I was told that there was nothing they could do because I used the self help service and I only logged the issue on the 21st and only after I was already sent the invoice. I sent the first call through on the 9th and only received my invoice on the 18th.<br> <br> Their self help issue failed and I have to pay for the mistake