Vodacom Fibre Contract a ****

Vodacom (Metro fibre) is a ****, I have been with Vodacom for about few years now and still their service was and still is terrible, they recently been over charging my account for an amount that I’ve never signed up for on the contract, I took a 12 months contract with them with the intention to save money as I was on a month to month contract which was very costly but better than how much I’m paying currently , surprisingly the amount kept going up still with no valid or even a contract amendments documents that I have to view and decide if ever i will be able to afford or not ,I have phoned them twice if not 3 times to let them know that what ever the increase that they added on my account I won’t be able to afford it but with no remorse the consultant said there’s nothing that they can do on their side. I mean what kind of a response to a customer is that? I told them that the debit order will surely bounce as I’ve never signed up for this and I was told that my account will be handed over to the legal team. So my question is how are they handing my account for something I wasn’t even aware nor signed for .I’m literally so disappointed with Vodacom and it’s service provider