Cell C is the worst!

Cell C's mobile app has been dysfunctional for almost a month now, so much so that I cannot buy data using it. So on July 20th, I bough data using their online website. Money got deducted from my FNB account and the transaction showed as successful on the website, however I did not my data bundle. I have called Customer Care immediately and they said it was my banks fault. I called 3 times during the evening and Friday and was told I need to wait 24 hrs, which I did, still no data. I then called on the 24th and again the message was they cannot help me, I must talk to my bank.

Called FNB and they also just shrugged and said, I must tell Cell C. Does any service provider care about the people that actually makes them rich??

What do I have to do to get assistance??