Vodacom service non-existent and *****ed when it suits them not to communicate to extend contracts to your detriment

I went all the way into a Vodacom store to cancel a contract that I have paid for two years but never used as the person left the company. I was told to email a letter to either *** or ***. - you choose!!! Guess what? Neither works. Same as other people can't find a single person to cancel. Well guess what, I have stopped the payment and will cancel all my other contracts held since 1994 if Im not contacted by end of business 26th May to sort this out.