PAY BACK THE MONEY!!

Terribly unhappy with the service received from Vodacom. My contract clearly stated R690 for my smart s plan however now due to the increase im VAT an additional R 50 has been added to my contract. No one has notified me on this or even asked for my permission about this and its completely sickening to think that because my details are available to you, you feel like you may deduct whatever. I raised a point with the consultant advising him that why are old customers billed for new increases? And why does this increase only apply to Smart S contract users? Also what if I want to amend my contract to a cheaper plan?... He could not answer me saying that they would need to investigate whether I received notification or not and then they would need to escalate the matter and that if I do amend my contract I would pay a penalty fee for this...Well clearly I didn't thats why I am calling...I am unhappy with the service and the Increase. Everything has increased but not everyone has the money to waste. This entire event lead me to believe that VODACOM DOES NOT CARE ABOUT THEIR CUSTOMERS ONLY THEIR MONEY...