vodacom bad service!

I have been having a problem on the 5th of every month, whereby R9 airtime is deducted from my account and buying me 9MB of data, I have logged a complained and they refunded me my money and assured me that the problem is gone, today 4th may airtime was deducted again from my account and 9MB of data bought I called again and the consultant was very rude raising her voice at me telling me how she cannot do anything about while the other day the managed to take it further and falsely assure me that the problem is done when it's not, I'm very disappointed with vodacom!