useless Standard Bank

I arrived in Brazil on 28 March, but informing Standard Bank of my travel. I made 2 small cash withdrawals on 28 and 29 March which were both successful. On the next day, however I discovered that my account had been blocked I am unable to make any cash withdrawals. I tried in vain to phone the bank but no luck. Then sent an email to information@standardbank, as well as 2 messages to phone me. Needless to say, nobody made any contact with me. Today I discovered to my horror that they blocked my credit card too. Now unable to make use of uber as well. The situation of being in a foreign country and not being able to draw cash or use your credit card is terrible indeed. I travel very regularly abroad and this has never happened to me. I've been with standard for over 40 years and if this how they treat their clients then clearly this is the time to change banks. This situation is truly appalling