***** on account - no help from Vodacom

I use to have a R110 rand Vodacom contract. This contract expired in December 2017. While I was on holiday in the Western Cape, "Someone" went into the Vodacom Shop Fourways Mall and upgraded this contract to R2,088 per month. I phoned Vodacom service and was adviced to log the ***** via email to their ***** department. I have done so numerous times without any correspondence or any acknowlegement. Vodacom just kept deducting the money monthly from my bank account. Last month, I asked the bank to reverse that month's payment. Which they did. I received an email and phone calls from Vodacom because my account is now in "arrears". At the moment Vodacom still owes me R4,472 - but they insist I bring my account up to full payment. They also acknowledge they can see the ***** complaint on my account, but still NOBODY from Vodacom has come back to me regarding the *****. The irony is that if I wanted a new contract they would have helped me in one day flat. But on a ***** matter, they just dont contact me to assist in correcting the contract. I was not even in Gauteng on 22 December when my contract "got renewed". This has now been going on since January 2018. It is 4 month's later, and Vodacom is sitting with my money, but I receive absolutely NO correspondence from their side - other than their accounts department that insist that I should bring my account up to date!!! Really bad service! I did not commit the *****! However I am paying for this with absolute NO idea WHEN or WHAT will be done to this matter.