Unable to fix an error on my account

Dear Vodacom

I have been battling with an error YOU made on my account since June and to date nothing has been resolved.

An additional nr. on my contract has been cancelled with effect from the 30th of June, but for some odd reason it still reflects as "active" on your accounts side and as "cancelled" on the cancellation department's side. How does that work???

Due to this error they keep on billing me for this cancelled nr.

I called Vodacom on 02/10/2020. I spoke to a consultant who transferred me to his team leader. She advised me she will sort this out and keep me posted. Heard nothing from her to date.

I called again on the 12th of October. Spoke to two different people who advised me that it was a billing issue on the account's side and that they would request a refund and escalate the matter for me to be sorted out. A guy by the name of Lewis advised me that he would handle everything himself and will keep me in the loop. Never heard from Lewis again.

I tried to call Lewis on the 16th, but no luck. Just another consultant with the same empty promises. Still no refund to date.

So I called today AGAIN. Firstly I tried the accounts department who advised me that the nr. is showing as "active" on their side and that is why they are billing me for it. Then he said it's a cancellation issue. He transferred me again to cancellations who advised me the nr. has been cancelled, but the back office made an error with the cancellation somewhere.

A 3rd or 4th escalation has been raised and I am getting fed-up with this. How can it take 4 months to fix an error??????????

This is by far the worst service I have ever experienced from any service provider.