FNB so very very Disappointed

FNB, how do you justify freezing a Credit Card that is in Credit on a Sunday. I got an sms and just like that my card did not work. Because I am not FICAd, but I have banked with you for 20+ years and you hold our Bond ??? You tell me to phone the number on back of the card and after going through the whole verification process you tell me the Service is closed on a Sunday and cut me off. I used the app message system and am currently number 114 in the Queue...... Go Figure. Service without a Smile !!!!