UNPAID NO FUNDS **** charges of failed debit orders

FNB in milking my account with charges so called UNPAID NO FUNDS. My salary is delayed and not paid in time. Now FNB decided to charge my account with countless R115 and now my account is -R1300 which they claimed they paid my failed debit orders and nothing was paid. I complaint about this earlier this year and this was reversed, and now they repeat the same story. This is ***** against customers. Once I sort out this, I'm leaving FNB.