False advertising and wrongful exorbitant debit amounts

I first joined Cell c to take advantage of a data package that they were advertising a couple of years ago. They advertised 10G(5G for day & 5G for night) for R80, following taking this up, Cell C must have only debited this amount twice or 3 times and not any more, erratic amounts would go off my account leading up to >R200 in 2021. I logged a several complaints and they would just close the complaint with feedback, "please receive feedback for case no.", but no elaborate feedback would be provided. When I initially called in to enquire, the agent did confirm that I was over-debited, however, not a single reversal was made!!!!!!!