Cancellation of Vodacom Contract.

I have been trying to cancel one of my contracts with Vodacom since 29th April 2021 when the date was due for cancellations. I have phoned the 'Cancellations Department' about 15 time, and to date I have received no confirmation of the cancellation. I have received two e-mails saying my request has been logged to prepaid and will take effect on,11.05.2021. The second e-mail received yesterday with the date now 06.06.2021. They have taken the R200 off my account for both May and June and I want to know WHY???? What is wrong with the Cancellations Department. They can see from their records that I have phone numerous times, but NOTHING has been done. Why has it taken this LONG to do a cancellation?? I would like a refund, as obviously someone is NOT doing their work.