Virtual Debit Card ****

I just found out that a virtual debit card that was used before can actually be used again WITHOUT a new pin. I was under the impression you can’t use a VIRTUAL card again without providing a new pin (which changes every few minutes on a virtual card). But no, some merchants can actually use it for a new transaction WITHOUT you authorising transaction with a new number. Shame on you FNB. Why have this supposedly safe system in the first place if you can bypass it? Will be taking it further with the banking regulator.