CREDIT CARD BLOCKED,EVEN THOUGH PAYMENT WAS MADE ON TIME - UNACCEPTABLE!!!

Why have you blocked my Credit Card??? I made a sizeable payment (almost 5 times the Minimum Payment Due,in fact) exactly on the Payment Due date. I WAS NOT LATE AT ALL WITH MY PAYMENT,yet you have blocked my Card!!! YOU NEED TO URGENTLY UNBLOCK MY CREDIT CARD,WITH IMMEDIATE EFFECT,RIGHT NOW! THIS IS UNACCEPTABLE! I also expect you to reverse any & all Declined Authorization fees also,as this was clearly NOT MY FAULT!