Not cancelling contract

I took out a new contract on 12/09/2024 with Vodacom online, I specifically asked the sales gentlemen how I go about porting our numbers, he gave me a number to phone and said once the phones arrive, I must phone this number and they will assist. However when I did this once I received the phones, I was told that they cannot port the numbers as this needs to be done before the contract is taken out. The said that the only way to do this is to cancel the contract, return the phones and take out a new contract. On 20/09/2024, I cancelled the contract, the phones were collected on 01/10/2024. Now the problem is, this contract has still not been cancelled and my account is still being debited. I have phoned several times, escalated this query several times, had the phone put down on me when asking for a manager, sent an email with no response. I keep getting told someone will phone me back, but no one phones me back. The last call (23/10/2024) I was told there is a delay in processing returns and that someone will phone me. This has not happened. I returned the phones over a month ago and this contract has still not been cancelled.