Poor continuous customer service, refusing to change simple debit order details even with proof of bank account details supp**** and no empathy for clients even when ill

I have been to and from for months with No Finance Cars, just to change my debit order details. Even while being sick, I went to get a bank statement at the ATM and they refused to change my debit order details. I then sent you online bank statements with my payslips attached to confirm the bank details and they still refused to change my banking details. I then went inside the bank to get a bank statement printed and stamped inside of Standard Bank and still 3 months later you are refusing to update my banking details for my debit order to go off. Dimakatso from No finance cars is refusing to change my banking details, forcing me to make manual payments every month and still you are debiting my old FNB account which I no longer use for debit order and causing me to incur bank chargers. Please change my banking details urgently or refund me for all the bank charges that you have incurred on my FNB account over the last three months. All my other creditors changed my banking details with a simple email or phone call. Why are you being so difficult?