Vodacom making me pay (R 6000) for contract is stopped over a month ago

So vodacom refuses to stop charging me for a contract I stopped in May.

On the last day of May, the 31st I called vodacom in order to pay off my phone contract with them, in the call I asked them how much would I need to pay to close off this contract as I did not see the need for it because I had lost my phone anyways, so I was told the amount, I was sent a document to sign fill in and resend to them, which I did with the proof of payment to their account, I was told to pay it off immediately or it will expire the next day, which I promptly did. I sent the PREMATURE CANCCELLATION QUOTE signed as well as the proof of payment with reference "I***4", then a few minutes later I received an email from vodacom with the following reference: ***. I specified that I want my number to be converted to prepaid. On the 4th of June i received this email:

Your Service Request *** is in now being processed by [name] [surname] who will be in contact you with you shortly. Your service request should be attended to by 2024-06-19 08:34:01. Visit www.vodacom.co.za/app from your phone. Thank you, Vodacom

The next day I get the following email:

Hi Mzimhle Mosiwe We have received your request to convert *** to pre-paid. It has been logged and will take effect on 2024-06-05 09:58:01. Please note that any outstanding usage costs will be billed in the next month's billing cycle. We recommend you use any remaining minutes and data before this date as it will be lost during conversion to prepaid. For any queries, please call Cancellations on ***.

After that on the 7th of June, I get an email saying that I owe about R -2,171.12, which didn't make sense to me because I had closed off my contract and paid the remainder already, not to mention according to the emails above, vodacom knew about it.

I then call in to enquire vodacom as to what is going on, my query was escalated, its been 2 weeks now, and all of a sudden since that time, i got an invoice today saying that I owe just over R 6000 on a contract i stopped over a month ago. No one has got back to me, when I try to call vodacom, they are not responding, not to mention that on my last pay day vodacom tried to take out R 5 000 from my account to pay it off, which i'm also not sure as to why that even is!