If this was taken to a chargeback to the card company, and they found out the card holder did not specifically approve the transaction, the chargeback would probably be done no questions asked and any appeal from sony ignored. Banking and sales laws always supercede terms and conditions for services. Of course sony could still ban the account just because they can, but they would be on wrong legal footing if they tried to claim he is liable for the payment.
Well I mean this is basically what often happens - the card issuer will take it as an unauthorised purchase and you might be in the right legally as far as that goes but then the company the goods were purchased from will see it as a breach of their T&Cs and take action against the account.