Vodacom contract cancellation nightmare

I have been trying to cancel my contract (which ended) for over a year now. I called them on the 1st of June 2023 to cancel the contract as i was due for an upgrade (They even have the recordings). And the 11th of July 2023 i received a statement showing that i do not owe anything on my account.

However in August 2024 when i tried to apply for credit with one of the banks i was told to i have an account that is arrears for over 6 months with Vodacom. I subsequently called Vodacom to find out what the issue was cause as far as im aware my account was up to date when i cancelled the contract and got a statement confirming this.

I spent an hour on the phone being put from one division to another, then evently got someone that said they would log a call and got it sorted. I was given a reference number (***) and told to call after a week. A week later a called you and was told i cannot be assist as the cellphone number im inquiring is no longer under my name.

I am frustrated as this is affecting my credit record and non of the vodacom employees that i have spoken to are willing to assist me.