Hi w-emiley,
We're very sorry to hear you're unable to pass the security verification process to get your handset unlocked. If you were in the US, we would ask you to visit a store to reset your PIN. In your current situation, being an ocean away, the only advice we have is to try to remember the security PIN you set up on the account. Perhaps you have a common number that you've used as a passcode for other things.