Vodacom has been charging me more than agreed to

Good day <br> I have been sent from pillar to post by Vodacom's consultants who have repeated failed to sort the the incorrect bills which have been charged on my account.<br> <br> I am hoping that you could be my rescue on this matter, because i feel as if i am being ****** by Vodacom for the following reasons:<br> <br> In November 2015 I took out a contract which was supposed to be a work related contract. I opened an account In Cape at Cellucity in Canal Walk mall, they assured me that they were going to deduct an amount of R 1180 with all service fees charges included. To my surprise Vodacom deducted R2000 , i queried th charge with the shop but they could not assist me, they referred me to sort out this mess with Vodacom. This amount was deducted before the 15 November 2015. After a few days later I had to change the contract, for valid work related reasons. I agreed to discontinue the the contract and I was advised that i would need to open a new contract and therafter to cancel the initial contract of R1180. <br> <br> In the very same month, I agreed to a contract of R 620 per month, Vodacom deducted R859 instead of the actual contract of R620