It was not so good to be questioned about so many things especially when it is your money. This is how things should be. However there are rules that banks are also following which I think is the reason why they would keep asking you about it when you are there client for around 30 years as you said. Think about the whole economy of your country maybe you will know why you aren't allowed to send money anywhere. This could be the same reason why cryptocurrencies are somehow banned in some countries. As for banks, they have survived everything for many centuries and generations so I think they won't be lost easily.