Horrific service to upgrade

I've called CellC on 25th Feb'21 to upgrade my month to month contract to a promotion (also month to month but better value) which was running for February. I've confirmed once again late yesterday that my contract has indeed been changed to the 8Gb Pinnacle top-up month to month just to realise that Ziyaad Gqirana loaded the incorrect month to month contract and did not cancel the recurring bundle as I received a SMS today stating that I have been allocated my 1GB on my Pinnacle 1GB contract. I've called and spoke to about 4 utterly *********** agents that could not resolve the issue. Finally I got to Vincent in sales and he established that the upgrade to the different month to month contract was loaded however the recurring bundle was not cancelled and low and behold a new sim has been send to me and without receiving it the new upgrade to the Pinnacle 8GB month to month contract will not take effect. Heaven knows why Ziyaad in his wisdom decided to load a sim swop and to send me the sim card without informing me about it! I have to wait 24hrs now for the sim to be activate and for the request to be processed and to kick-in. That's now if it will change at all. This is the worst service I have ever had with Cell C, the most *********** people that I dealt with except for Vincent trying his utmost to assist with the mess that Ziyaad Gqirana has made. I've emailed this morning asking for a manager to call me back with no response yet neverminded a call. If I could, I would end my contract and move to a supplier that have competent staff, listen to my request, implement it without telling me a bunch of *******, sending me a sim that I did not request and inconvenience me as a result of it. The best was that one of these consultants told me that I need the new sim card for better LTE reception etc. Seriously!!!