Used to work in banking, admittedly on the debit card side of things, but SE rep is 100% correct. The declined authorization will be sitting in the pending transaction of your card provider. You will need to speak to them directly, and depending on the adviser you speak to, will need to direct them to this area of their systems. It would probably be the fraud department that has blocked this, so you'll probably need to be forwarded on to them to remove any 'flags' they have on your account once the pending transaction has been cancelled, then you can try again.