Vodacom , disgusting service

Recently went to the Vodacom repairs fourways store based upon responding to an sms that my contract is up for renewal. The consultant process the upgrade and failed to advise of certain charges. The store managers acknowledge that he acted wrong and I told them that I want to cancel the contract which she stated that they will do so. When I was at the store, she then changed the story and now cannot cancel the contract. She brought another person whom she said was the area manager and he stated that they will not be cancelling the contract and are holding me at ransom to this. I found out that the person is not the area manager, and she ****. He was intimidating and forceful with his words that they will not cancel the contract , yet the sale rep was wrong in his actions. I have been in contact with numerous departments at Vodacom and with many empty statements that there is a department who can assist, and they all failed and end result they cannot assist. Now it appears that Vodacom is also holding me at ransom to this Contract yet their representative has contravened the CPA. There are countless calls and emails sent to Vodacom and this is ignored. Is this the useless service offered by Vodacom.