No thinking going on

Today I receive an SMS stating that My credit Card facility has been cancelled and that further use of my credit card may constitute ********** activity. I have been with this flippin bank for nearly 30 years. My credit limit is R100 (yes .... One Hundred Rand). I usually put money into the card and work towards a 0 (zero) balance and then top up the card again. Sometimes I go over the limit but correct it immediately as soon as I become aware of it. When I called to find out what was going on I was told (very politely) that my limit was exceeded by a very high amount. How much? R1000 which had been corrected on Sunday through a transfer but due to archaic systems only reflects the next business day. Why can my bank not get its systems right. Surely clients of good standing with over 30 years loyalty should at least deserve a phone call. What bothers me most is how standard bank will rather strive for mediocrity.