Poor assistance with unauthorised transaction

I recently called FNB to enquire about a transaction for R99 as I received an in contact sms for a transaction I did not authorise (call reference Rr***). The agent told me no payment for R99 was pending for any of my accounts. To my surprise when I checked my transactions this past weekend a debit order for R99 (ref LEAGUELEGNLL***03) had been placed without my approval. I found this weird because the agent had notified me that no amount for this company was pending. I have cancelled the debit order, but I'm not happy with the charges that I've incurred as a result of this. My issue is that I feel that my banking details have been compromised and I have been charged for something that I did not authorise. I would like for these fees to be reversed as I was told that the transaction would was not pending.