Not able to cancel MTN account

I sent and email on the 24th May 2023 to request the cancellation of my MTN cellphone account, notifying them that I would be leaving the country. This is 14 days more notice than the required 30 days in my contract. I was then asked for my 1.MTN Pin no 2. ID Number 3. ADress 4. The Name of the Bank. To which I provided all the information that the company already had but not my PIN number as I did not have an MTN pin number as far as I knew. I was immediately suspicious of ***** given how badly spelt the request for information was. On the 31st May I was then asked for the reason for cancellation even though I had already clearly stated this in my cancellation email. I told them again and they sent a mail to ask if I would like to migrate my account by filling in a form, I ignored this as I did not want to do this. I then emigrated to the UK and followed up in August 2023 when my SA account was still being debited. In response to this I finally got a early termination quote on 4 Aug 2023, 2 months later than my initial request. 2 Months seems an excessive amount of time to process a quote for early cancellation. I paid this and sent the proof of payment via the banking app to the address I was provided. They also asked me for a signed company letterhead and the Director’s ID copy even though this was a private account. Despite this they still sent a follow up asking for further proof of payment. I then got busy with work and Xmas so I left the follow up on this until Feb 2024 when I followed up because I was still being debited for an account that I had cancelled in May 2023. They then sent me another early cancellation quotation seemingly ignoring any previous communication and proof of payment. I sent them the proof of payment attached to a reply to this mail with screenshots of all the relevant information. Their response was to then send me a notification that they have processed the migration to Pre-paid for the number *** with immediate effect on 18-03-2024. I did not request this and I am most certainly did not fill in the migration forms they had sent. I hope that this reaches someone at MTN that can help me sort this out because I believe that my information is being used to create a pre-paid account that can be used *****ulently.