Vodacom AGAIN

Once again, Vodacom just never ceases to amaze. I purchased a 5gig data contract in 2016, which according to my knowledge expired at the end of June 2018. I called towards the end of May, and cancelled the contract that would expire end of June 2018. The call centre agent told me that it would come to an end, end of July 2018. I accepted this as I agreed to the contract terms and conditions. To my utter chagrin, I notice on my next statement, that not only am I still paying of the data, the cost has now gone up with more than R50. So I call Vodacom this morning, and spoke to Tefo, who then tells me that the contract has in fact, not expired yet, and it will only expire on 1 Aug 2018. This is very baffling to me as I took out the contract in June of 2016, add 24 months that brings us to June 2018. I asked him then, why did the cost suddenly go up with more than R50, to which he tells me, the contract had expired and thus it means the discount, has been forfeited. When I told him that this makes no sense whatsoever, how can you tell me on the one hand it only expires on 1 Aug, but then the next moment you tell me the discount had been forfeited due to the contract expiring?? I asked to speak to a supervisor, whom to my utter shock, was not available! They had all gone into a meeting till 9am this morning. It is now 12:30 and I have not yet received a phone call from anyone to explain to me how a contract can both have expired hence discount forfeited, and also not expired even though I telephonically cancelled within my 30 day period. Always with Vodacom, everything has to be a fight and a battle. I am so exhausted with fighting with this company.