Extremely terrible service, misleading and dishonest

I am quiet disappointed on the process and extermely bad service received from nedbank.

I requested to reverse a debit order that runs on the 1st of every month, I called on Saturday 10/12/2018 to reverse a debit order for 1st October . According to banks principles you can reverse a debit order within 40 days , the debit order was still within 40 days on the day but I was advised it cannot be reversed and no proper reasoning was provided except for the system does not allow. How come? It doesn't make sense. Then you should rather change that principle because you're misleading clients thinking they will reverse within 40 days yet it's not case. I requested the acting manager that was working on Saturday to escalate the matter, and she assured me that will call back on Monday to provide feedback but till today no call have been received from nedbank. It's so disappointing that nedbank cant keep to its word , other banks are able to reverse on the 40th day since its still within the period I don't know how you operate but I'm disappointed thank you for nothing , I would rather close my acc I will move my home loan else where and other accounts will be closed as you are dishonest to your clients and cannot even get back to them. What happened to providing feedback? I want that debit order reversed , I want my money back especially after this terrible service. You are misleading clients, you're dishonest. If it's not done I would take it further.