Unauthorized upgrade of Contract

On 16 January 2015, Vodacom upgraded my contract without my authorization and my consent. I only realized something is wrong when I check my bank statement and see that my Vodacom bill is about R500 more as usual. They deducted R500 via debit-order for the contract upgrade which I did not request or authorize. The next day the contact upgrade was reversed(before I could could complain). Today is the 3rd of February and Vodacom has still not repaid my R500. Every time I contact Vodacom they are busy sorting it out. <br> <br> I am penalized for ***** or faults on Vodacom's side.<br> <br> Terrible service!!!