Cell C, oh help me!

I have been a Cell C client for many many years, but I get treated like a ********. I have been trying to get a new phone for almost two weeks now. My upgrade was confirmed 6 days ago, and my data disappeared. I called the call centre several times, get asked the security questions, and when I forget if my credit card is a mastercard or visa card, I get rejected, and must call again. I am so sick and tired of this. I called 5 days ago about my "lost" data, the agent told me to buy data on the app. I did this. Still no data (even though it shows on the app and I receive sms's with my data balance). I called again, was informed I should call technical department, only to hear I have reached them outside office hours. I called two days later, and then I failed my security question. Nevermind that I am at work, and only have few minutes to sort this out. So now I actually want to cancel my contract, and everything that links me to Cell C.