Horrible experience

How is it possible that vodacom can do what they want, lie and cheat and change your contact just how they want. Without consent. My contract is still not fixed although you promised by Friday everything will be sorted out. But to my surprise I woke up this morning and yet a again a new price plan was send to me by sms and via email, again I didn't consent to any of this. My price plan was R377 now it is yet again R546. My data was 1.3 Gig now it is 4 Gig witch I didn't asked for. And definitely won't pay for it. I didn't ask for a upgrade on my plans, a horrible woman from your call center phoned and said I can save money on my 4 contracts and the call is recorded on my selphone as well, well she didn't save me money she *****ed and put my amounts up. How is this allowed and why is it not fixed. How many times do I have to phone during my work time and get empty promises and reference numbers, and tell you that I didn't agree to a increase of data I didn't ask for a upgrade on any plans . Please fix this because I won't pay and can't afford to pay this exstra cost