CELL C stop wasting time and resolve incorrect charges.. 6 months - this is ridiculous!

I have 4 Cell C devices – (been with them for longer than 5 years) of which one was due for upgrade according to Cell C store (Forest Hill) on 24 Feb 2018. Since March 2018 I have been charged with ********** amounts pertaining to the particular device. I re-visited the store twice and on first occasion the most stupid excuse was given (Calls to “unsupported" numbers charged, and that Cell C only charge for these once every 3 to 6 months). The second time I was verbally assured that the problem will be resolved immediately. In the meantime, I also logged various calls (with reference numbers) at Cell C customer care service with zero results. Eventually on 11 April I received a mail from Customer service that the account and relevant cost will be rectified and specifically confirmed the correct cost going forward. At May month-end .. surprise… ONCE AGAIN the costs were not rectified. AGAIN, queried and on 24th May 2018 I received a mail from Buysiwe Ngubo (Cell C customer centre) that they were in contact with specific store and that the overcharged costs will be recovered and account rectified. This did NOT happen and still ongoing .. it’s query after query with no results – One cannot even get to a senior person .. or should I contact Jose’ de Santos publicly / directly to get ATTENTION! .. this is also affecting my credit status … What else Cell C! .. the next step is public, going to Consumer Council and others .. this is outrageous. Cell C was quick running to court pertaining to the ICASA ruling claiming their systems complicated (nice word for being a mess) etc…. it’s actually just playing for time to *******ly make as much money from customers than anything else…. CELL C I WANT THIS RESOLVED VERY QUICKLY!