In the UK, the law is 100% on your side for credit cards. Just raise a consumer credit act claim, and unless the bank can show serious failings on your part, you'll have the money back.
"proving" that there hasn't been a security breach somewhere in their infrastructure is impossible, so you'll pretty much always win.
"proving" that there hasn't been a security breach somewhere in their infrastructure is impossible, so you'll pretty much always win.