FNB abusing my account

I have been banking with FNB for over 15 years now, their services nowadaya is very and very poor. I reported the lost of my bank cards on 7th of June and cancelled them immediately after the incident. and I personal went to the branch to confirm the cancellation of those cards, everything was ok, money on my credit and cheque card was there. But at my suprise I got notifications on tuesday the 12 that all money from my credit card was used in some toll gates some where in Limpopo. I called their ***** department and they assisted me and was reversed. But now the same *****ulant activities is happen to my cheque account and the is being used in some toll gates again: pumulani, carousel and them. How do I trust FNB now, I have some many accounts with them: 7 days notice account, credit card, cheque, saving pocket, share saver etc. my cheque account was used until in on negetive and being dishonoured as we speak. Can someone assist me to sort out this mess done FNB. HOW CAN A TRANSACTION HAPPEN TO A CANCELLED CARD?