Unauthorized debit orders

I have been experiencing unauthorized debit orders since 2018 August 2018 to current. I have spoken to a number of consultants, ***** department and supervisors in seeking for assistance regarding these nightmare of unauthorized debit orders from my cheque account. The debit orders ranges from R99 - R135 with different reference numbers. I have been asking the supervisors why they don't have security measures in place and the response I got was they are working on it. Today the 3rd of March 2019 I received another sms for an unauthorized debit order and what makes the matter even more frustrating the supervisor was arrogant and when I asked why am I banking with you FNB if my account is not secured? Why do I have to keep on explaining myself, keep on disputing and stopping unauthorized debit orders? "She rep**** by saying I can do whatever I want and close the account as it is my account and also I am not the only customer dealing with this". As if that statement is supposed to make me feel at ease. I got annoyed at her attitude as clearly she does not value customers. They should change their slogan from "how can I help you" to how can I be ***********".