fnb ridiculers charges

Good Morning Fnb why are you treating me like can you please explain how the bounced debit order of R2260.00 the unpaid fee can result in the amount of R1100 I even went to the branch I was advised to just pay and carry on with life just like that, i sent a complain via email and nothing come back from you am i being treated like this because I'm black or what please explain to me