I am lodging a complaint regarding an unauthorized change to my Cell C debit order details

I am lodging a complaint regarding an unauthorized change to my Cell C debit order details. My Standard Bank account was set as the designated account for monthly debits. However, Cell C began debiting from my Capitec account without my consent or prior communication. Because debit orders are not processed from my approved account, my Cell C account repeatedly falls into arrears, forcing me to make manual payments. I should not be penalised for a change I did not authorise. I request immediate correction of the debit order to my Standard Bank account, written confirmation that no further unauthorized changes will occur, and reversal of any penalties or negative implications caused by this issue. I expect urgent resolution.