Vodacom makes me see Red

I had a Macbook air on a 36 month contract and I contacted Customer Care and they informed me the contract would end on 10 February 2023. I sent an email to customer care on 13 January requesting they cancel this contract as well as a contract for a 3G ****el that I no longer use. I had no response from customer care so I contacted them to confirm they had received my cancellation request which they acknowledged. Then on 1 March another debit order went through my account for this contract. I sent an email on 12 March and another one on 13 March saying I am waiting for a response nothing happened. I then called cancellations and they apologised and said there was an error and I would be refunded but will take 14 days. Nothing was forthcoming so I phoned cancellations again and I was told that only one contract was cancelled not both. They stated they will sms me a canfirmation but I received nothing. The 1st of May came and Vodacom put another debit order through for another amount. Now I was really angry and I went onto my banking app and reversed the transaction. A week later I get a collection notice for the amount I reversed and was told they will have to escalate the matter to management but I had still had no confirmation. And guess what they put another charge through on 1 June which I reversed again. I am not sure who Vodacom employ in their call centres but none of them seem to have any intelligence . This has been going on for 5 months now and we are no closer to getting resolution to my cancellation request.