Vodacom *****ing Money From Customers

Vodacom is *****ing money from customers. They have been overcharging me for the past year and everytime call their customer service they log the incident and i do not hear from them again. I have been charged the correct price for 5 months of my contract and thereafter been charged over R500 extra every month for the past year. My latest reference number is 1- ********** ********** and vodacom sent a message to say this issue is now closed. This cannot be closed as they did not pay back the money which they overcharged me and did not even call me to let me know the outcome. I know that I am correct and so does vodacom and that's the reason they don't get back to me. Surely they have the call recording to listen to when they issued the contract. Surely they can figure out what was agreed for the 24 month period. I will now advise all my family and friends and all people i meet to move away from vodacom as their strategy is to ***** money from customers. Everyone i speak to at the customer service sends the request to the solutions department who then send this to some back office and nothing gets done. Pathetic service