FNB negligence

i have a Revolut account since we reside in Croatia, and I use my FNB credit card to transfer money as needed for the past 2 years. My FNB credit card expired, I renewed it in Standerton upon a visit and when I wanted to change the new details on my Revolut account, FNB blocked my credit card. After being in Secure Chat for longer than an hour, sent from post to pillar, it was still not resolved. I was referred to the ***** Detection and still no reply after 2 days. One agent mentioned on Secure Chat that my credit card was blocked because it was not picked up from the FNB branch, but I sit with the card. This was their negligence, and because of this delay the currency conversion increased tremendously, I am losing money, and this is preventing me to operate. (Please note that the phone number is a Croatian number(+385), and it does not allow to enter international numbers in this post.)