Still furious over my incorrect billing and lack of contact with Vodacome

I previously wrote a review about the shocking state of my account when trying to cancel a number when I had paid off the early cancellation fee. I received a response that someone would contact me, which no one every did!! Not only did I not receive a call, but I now received a split bill!! How is that helping get my account set up correctly at the correct price? Does Vodacom think that if they split my bill I would not realise that I'm being over billed?? I've also not received the refund that is due to me after being overbilled for 8 months????