I understand from our contact that you did not recognise some transactions on your account, and you reported these transactions as unauthorised. We do insist (an obligation outlined in our Terms of Service) that the SEN account holder is responsible for all activity and transactions made on their account.
Due to the nature of digital content, in that it is made available immediately and cannot be returned, we need to insist that the account holder take full responsibility for their account security.
As PlayStation Network has not been compromised, I can assure you that any information stored on our servers is secure. We would highly recommend that you change your account password to re-secure your account. The billing details have already been removed from your account, but our investigation showed that a third party may have accessed your account.
We cannot speculate on where this user log in information was obtained, but you may have fallen victim of some type of internet fraud, which includes practices such as phishing, brute force attacks, in-game scams, and gaining access to accounts using e-mail addresses and passwords from elsewhere.
I am happy to inform you that we've refunded to your SEN account wallet for these transactions, and that amount is now available for use.