Unauthourised Overdraft charge

I am very disappointed with Standard Bank. I have been charged an overdraft fee of R69 whereas I don't have an overdraft facility with them. I understand that my account was on minus ***ing monthly bank charge) but this would have been paid on my salary date. The fact that I am being told to accept an O/D fee that I knew nothing about is nothing short of shocking!! I have had this account since 2010 and it would be a pit to terminate due to both carelessness and callousness. What is happening here violates all pillars of TREATING THE CUSTOMER and I am hoping that this charge is reversed immediately as this has NEVER been communicated to me in the 10 year tenure that I have had an account with Standard Bank. I will be looking forward to having one of the consultants call me as soon as possible