FNB CRAZY UNPAID DEBIT ORDER FEE

I am very angry and disgusted at FNB, What they did to me is true *****ing and bullying, they charge me R100 for unpaid item for R100 debit order that I did not even signed up for. Unathorized debit order but also charge me R100 for a failed unauthorized debit order. The worst part is does FNB understand how much is R100, some us can buy a grocery with R100 and FNB sees the predators that they have to hunt and chow. I want my R100 back.