Pre-cancellation from 2023 still not processed in 2024.

Pre-cancellation not processed in time. I took data sim with Vodacom in the year 2021 for 36 months contract. Then in 2023 I paid the outstanding amount and requested a cancellation on the account. They demanded some documents and I sent as requested. To my surprise I realised that Vodacom was still deducting money from my account. I tried to get home loan, then they notified me that I have areas from Vodacom. I called them concerning the matter. They only opened the email I sent them in 2024, when I notified them that I sent an email for cancellation. They told me that they will call me and process the cancellation. I called in two consecutive weeks, still now they did not get back to me to tell about the process.