Vodacom useless service

Today I had a unpaid debit from vodacom. I called them immediately because I saw the debited an old account one that was used more than a year ago. Vodacom has debited me from the correct bank account for more than a year but just this month they decided to debit the wrong account. When I enquired about it they told me that they don't have my standard bank bank account. I ask the question how did you debit me for the last year? My account is paid up to date? It's only July that is not paid. My standard bank bank account shows the debit on the bank statements. Then the consultant says they will log a service request. I'm still waiting for this now. I refuse to pay the penalty for late payment this is not my fault. Vodacom clearly don't care about sorting this out nobody called to sort this out