40% increase in fees

Have just received my latest Credit Card account and the monthly fee has increased by more than 39% - and then they claim that inflation is only about 6%.<br> When I queried this with the Credit Card contact center asking when they had informed me of this increase they first had to investigate and then claimed that they had sent out notices on approximately 18 December via both email and SMS.<br> I have checked all my statements since that date and they did not incorporate such a notification. My inbox had no other communication from Absa for December and my deleted box - that was last cleared in July 2015 - contains no communication from Absa. How can a bank just increase fees by 40% without informing customers?