Charged for Unathorised debit orders by standard bank s

I'm so disappointed and hurt. I got 3 unauthorised debit order in my standard bank account. Unfortunately I had no funds in the account and I was charged.when I called the bank to allert them I was advised to go and dispute these inside a branch how ever in the bank I was met by an unhelpful employee who asked from me what must she do. All banks are aware of these and as far as I understand banks benefit the most should these debit orders bounce. I am now left with approximately R380 due to the bank. If the banks can't protect our accounts knowing that this has been going on for so long. I have banked with standard bank for over a decade but this is uncalled for. I believe standard bank does not provide help because they benefit.