Overcharged by over R1400.00 for Jan. for Content

I was overcharged in Dec by approx. R300.00 and then for January by over R1400.00, when I looked at my account on line it showed that I was charged for Content Services, which I have never heard of before, have tried contacting Vodacom on line, by phone and all I got was that they require the same information over and over but do nothing about it at all. I feel that they should be looking after my account the same as the bank looks after my money, and if my account was hacked into it's the bank's responsibility. This happened to me some years ago and I was paid back, but I had to go to WASPA to get it done, can.t wait for my contract to end in March!