Cell C Accounts Department mistake AGAIN

It is with great dismay that I yet again have to resort to this platform to get Cell C to correct their Statements and charges. I tried to call their customer service to log an enquiry as they do not list their accounts department phone number. When I told the lady my problem with the billing I saw on my statement I was told that it is an outstanding amount from December 2021. However the opening balance on my statement was paid in full on the date cell C debited my account and did not "bounce". 31st January 2022 Cell C decided that on the 5th February 2022 that they would charge me R70.00 for failed debit order. When I tried to ask for what failed debit order they tell me it is from December 2021. Yet if that is the case then why was it not reflected on my opening Balance on my February 2022 statement or previous statement. I would like Cell C to give a phone number for the Accounts department and not let their call staff try to explain away accounts department errors