A warm welcome to the world of financial surveillance! The banks surveillance algorithm has identified your transaction habits as suspicious. You are not conforming to normal activity. Maybe you are a money launderer or terrorist? Your banker asked, because he/she trusts the algorithm more than you. So better stop your highly suspicious activity or they will stop it for you, starting a full-fledged investigation.
It's not advisable to try to explain Bitcoin to them, because things they don't understand are suspect as well. They may even research the topic and find some mainstream media articles connecting Bitcoin to money laundering and financing of terrorism. And in the unlikely case they understand Bitcoin, they will certainly not approve it.
That's how life has become in the centrally controlled fiat world... If you ask me, better buy your Bitcoin with physical cash in a person-2-person trade.
ya.ya.yo!
Couldn't have said it better!
This surveillance and dictation of how, when and probably where you can use and have to spend your hard earned money ist just ridiculous.
They will close/freeze your bank account and then you have to deliver waterproof facts that you haven't done anything criminal, although they are doing criminal things to their customers on a daily basis.
That's why I would prefer to buy bitcoins via local real life trade as well, even for some premium price.