Contract upgrade nightmare

In June I was due for an upgrade which I was not planning on upgrading as we have fibre in the house . However I got a call from one of your sales agent ladies who convinced me to rather upgrade my line and get a device as you guys were running a special on some Samsung device .I thought this a was a great idea which I agreed upon . We concluded the sale and I waited for my device to be delivered, however weeks went past without any communication. I decided to go into your Greenstone store as I was at that mall at the time and instead of getting helped I was told that we do things online and when we have problems we decide to come into the store , this yielded no results . I then decided to rather cancel this whole contract as it was not what I asked for so I I called the customer centre on numerous occasions to no help, instead a agent by the name Kevin promised to call me with a device offer but to this day never called . I then decided to go to Vodaworld hoping that this will be the end of my runaround but instead the floor agents there could also not help and contacted the online guys as they are apparently the only people that can do cancellations. Nobody answered and instead was promised to be called back but to this day nothing has happen . For the past 2 months I have been paying for a contract upgrade I did not agree upon ,I am paying a lot of money for a data upgrade I did not ask for , this is even more annoying because I lost the SIM card and is not even using the data yet I have been upgraded to a higher data plan . Can someone please call me to sort out this mess because I will no longer pay for something I did not ask for . This past month will be the last I pay from next month I will babe forced to cancel both my Vodacom contracts and rather move to prepaid if this is the kind of customer service I get after being with Vodacom for so many years .