Misleading Customers to Profit

I purchased a 10GB+10 GB data bundle in July 2017 for R299 per month for 24 months. After 5 months, in December 2017 my account was debited more than R10000 (Ten Thousand Rands). I called Vodacom to query this account as the maximum outstanding amount should have been R1500. I did not receive any clear reason for this huge bill. At my request, my bank reversed this transaction on my bank account. In January 2017 Vodacom terminated my service for non-payment. I queried this and was informed that this was an open contract and not fixed capped. This was not what I purchased. I was of the understanding that a bundle was a fixed amount. I was misled and I am sure other customers had this experience. I requested a transaction history showing all the data usage and the users and to date I have not received this. I have made many attempts to get this matter resolved with very little factual response from Vodacom. They have handed over the account to collection agencies and with interest, the outstanding amount is more than R11000. Please do not purchase any Vodacom bundles without getting your lawyer to review and approve the contract.