FNB - Virtual Credit Cards not save at all.

I am so frustrated with FNB. FNB advertise that it is save to use your virtual credit card for online purchases because the CCV at the back of the card changes every few hours and once it has changed your card cannot be debited again. Guess what, it is a total lie. A virtual credit card can be used for subscriptions. That means that your virtual credit card can be debited on a monthly basis with different amounts, without a new CCV. What is the use of a virtual credit card if it does not protect you against recurring transactions?. This just happened to me. I have lost approximately R14 000.00 with duplicated transactions of different amounts on my virtual credit card. Beware there is no protection at all on a virtual credit card, you might as well simplify your life and use your normal credit card because your virtual credit card can be used over and over again like an subscription without a new CCV.