Debit order date changed without my approval.

Standard bank sent debit order before my salary pay date,making my account a mess and messing my credit. I went to one of their branches, their incompetence consultant told me to loan department without even checking. I phoned to my surprise debit order date changed without my knowledge and I was told to pay cash . I PAID CASH THE MOMENT I DROPPED THE PHONE. BOOM TODAY THEY SEND ME MASSAGE TO NOT PAY. WHILE I ALREADY PAID . WHAT A BUNCH OF UNPROFESSIONAL PEAPLE GROUPED TOGETHER. TERRIBLE SERVICE FROM BRANCH CONSULTANTS ,CALL CENTRE AGENCIES AND LOAN DEPARTMENT. I CAN NOT RECOMMEND THEM TO ANYONE.