Contract cancelation

Good day, I have been battling with Vodacom to close my contract account tor months after it expired earlier this year. I don't understand how it has been so had to do this simple task. I've called a number of times and last time I was told that this account will be closed. It has now accumulated so much charges because it's not closed. I asked them to deduct the money as unfair as this was but I was just so tired of the back and forth but still the money was not deducted and this has affected my credit score drastically.

I went to a Vodacom store and gave all my details and was told that I do not have an account with Vodacom I showed them the invoices that I used to be sent and gave the number of the contract but still nothing showed. I was sent aware with a number to contact ***. I called the number and I've been battling to get through to a consultant to assist me and it keeps saying my ID Number and cell number provided are invalid.

I would let this go however this is affecting my credit score. What do I need to do to get this sorted.