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It's not your money, mate. It's an IOU that can be moved around if the bank permits.
That being said, conditions under which the bank may refuse a withdrawal or transfer should be unambiguous and outlined in a signed agreement or a ToS. So the case here is either:
  • The bank changed ToS (and you never read it, because who does) and can indeed refuse a cash withdrawal. Tough luck, shoulda kept your money in a permissionless system.
  • This is a "soft-ban", i.e. something they do because they're pressured by the gov't but it's actually nowhere in writing, which may be grounds for a legal action.