…. because there were unusual transactions on my account.
Yup, that will be because it is Christmas and I've been present buying you morons.
So now 4 days before Christmas I have no functional credit card. There will also now be issues about trying to return gifts I have already bought as the account will no longer be active to receive refunds.
You seriously couldn't make it up. So AIBU in thinking their fraud detection software should have some seasonal flexibility build in?