********** debit orders from RNM and DOUBLEJCE allowed by FNB.

I have an account with FNB and have been their client for a couple of years now, I've been getting unauthorised debit orders in my acccount, in February it was from RNM Holdings in which they took R95 from my account, I reversed and cancelled the debit order. This month I just got another unauthorised debit order from DOUBLEJCE amounting to R89. I don't know how FNB allowed this to happen because they had said I have to authorise all the new debit orders in my account, how was I not alerted about this supposed new debit order?? This is just substandard service....