Account put in arrears when payment has been made on time

I have vehicle finance with WesBank and have NEVER missed a payment, last month they called me the day that the debit order went off and said that I had missed my payment. I called numerous people, no one ever called me back, I eventually sent my bank statements to Nothando Makhubu which showed that the debit order went off - I even emailed and asked if the issued had been resolved and have never heard back from anyone. Now my credit report has been updated with a "missed payment" from WesBank WHEN MY DEBIT ORDE WENT OFF. The debit order date is the 25th of the month and the debit order went off on the 24th and they have listed me as in arrears. I have tried calling the call center and cannot get any assistance! This is ABSOLUTELY shocking!!!!