Contract cancelation refund

I am so fed up with Vodacom. My contract ended 2 months ago and I called in to cancel and to go onto prepaid. The next month I received airtime and had to phone in again just to be told the cancelation wasn't put through. Again I was promised a cancelation and a refund the end of August 2021. It is the 1st of September, no refund and my new contract data is not activated. I switch on the data and it does not connect. Why does one always have to phone in more than once to cancel a contract, it is absurd. This is the second time this has happened to me dealing with Vodacom. The call center agents don't do what they're supposed to do when one phone's in. I'm sick of it!!!!