Refuse to cancel debit order

I am getting so fed up with having this problem every few months. Last time I asked that you cancel you debit order/direct debit on my nedbank account and you gave me some bull**** story about it cannot be done. Now each month I pay cash and as I paid the R300 cash before month end but still on the 1st May you stupidly deducted R298 from an account I no longer use. Who would have been liable for paying any charges on the account had I not had the funds in the account. Again and for the last time I will ask stop you stupid direct debits or I will report you to the consumer protector. Plus I keep sending this same complaint via your app and online account but I get no reply.