Cell C changing debit order dates without informing me as a customer.

Today I went to cell c store in The Grove mall Pretoria because cell c customer service phoned my daughter on the 05th to tell her about an upgrade. When I got to the store the consultant told me my December debit order was not paid and my account is blocked, to my surprise both the lines that I have contract on are working. I showed her my bank messages to show that Cell C debited my bank account she said I must bring a bank statement to show that Cell C debited and I told her I can't pay for a statement that I have prove from my banking app to show that the debit order went off. I called customer service and the consultant told me that it was my fault that cell c debited my account on the 4th of January, cell c is in breach of contract because my debit order date is mostly on the first, I wasn't notified prior that there will be an early debit order by a phone nor an SMS. Then the consultant transfered me to upgrade department I got the following reff no *** Nokulunga was assisting me, she said my score is low due to the late payment which happened because of cell c incompetency, I gave cell c permission to debit my bank account now I am at fault that cell c didn't debit my account. Please sort out this issue or cancel my account and this month you debited R318 which I don't know is for what. I cannot be told 3 different answers from a Cell c system that is supposed to talk the same language.