Cell C - Shocking service

Case number:*** Towards the end of July, Cell C marketing dept contacted me to do an upgrade of my existing data package that was expiring at the end of July 2021. I agreed to the upgrade and on the 3rd August I switched to the data card on the dual sim phone. I could not connect to the Internet. I contacted the customer care line and spent a frustrating evening speaking to three different people with no success. The 3rd agent said that they will log a call with the tech dept. They phoned me back 5 days later only to find that THE MODEL PHONE I HAD DID NOT SUPPORT THE UPGRADED PACKAGE. I was furious because why didnt they checked what phone I had BEFORE contacting me????? The only solution was to revert back to the existing (expired) package (10gig for R129pm) At the end of August however my account was debited with R186. I have been trying since 30 August 2021 to get Cell C to firstly admit to THEIR mistake (marketing me the wrong package) and secondly to refund me. The case has been escalated for the 6th time today to the finance dept (that is where this query started) and when I asked how long it will take, I was told that their turn around time is 7 days. That takes me to the 27th September 2021 ready for another incorrect deduction. I am paying for a mistake Cell C made and I am getting no answers from them. Ive been a loyal Cell C customer for almost 14 years now and my phone upgrade is looming. I am not happy to even think of signing another contract to receive this shocking service.