Vodacom lies about upgrade and lies about resolving issue

On 30 August 2019 I was called by someone (I believe Kedi) from the retention department regarding my contract that was past it's upgrade date. I am on Vodacom Red Select + and he promised to keep me on this package but provide me with 800 minutes and 7 Gig of data for R499 per month (SIM only). I agreed.

On Monday 2 September by using the Vodacom app I saw that I was now on a top up package with 200 minutes and less than 2 Gig data. I called Vodacom and was assisted by S Shembe who then cancelled by upgrade (or rather downgrade). The problem was this cancellation will only be effective 1 October and I will then be on my old package and not the one promised to me. He advised that I call the retention department.

I called the retention department on 2 Sept and spoke to a Team Leader who promised to listen to the recording of the call with me and call me back before 13:00 on 2 Sept. No callback was received.

Later on 2 Sept I called the retention department again and was this time told they will get the agent who handled my upgrade (or downgrade) to call be back. No one called me back.

On 4 Sept called the retention department again. Spoke to Portia Ntombela. She promised that they will sort out my issue and give me detail feedback by 9 Sept. She also promised to credit my account with additional minutes and data due to the incorrect upgrade. No minutes or data was added to my account. No feedback as promised (today is 26 Sept).

On 26 Sept called the retention department. Spoke to someone who wanted to get someone to call be back which I refused as I never get called back. Told to hold several times until I passed to the end of the call rating and call ended without my problem being addressed after 20 minutes.

Called again and after 10 minutes holding was routed to the end of call rating.

Not sure how to resolve this.