Sony / PSN Automatic Payment Using the Wrong Card

Description

Hi there,
I have set up Paypal as the payment source for my « Sony Interactive Entertainments » payments, but for some reason the payment is being taken off the wrong card; I was given no option to select one when attaching Paypal to my PSN account.
I have checked the payment settings in Paypal – the « Funding source » is set to « Paypal balance », and my default card is set up correctly in Paypal… but PSN is taking payments from another card (one of my business accounts).
I am unable to change the payment source on the subscription in Paypal either, as when I go to Settings -> Payments -> Manage Your Automatic Payments -> Select the « Sony Interactive Entertainment » entry -> Click on « PayPal Balance » under « Funding Source » I get the following error:
An unexpected error has occurred. We apologise for any inconvenience. Please try again later.
Can anyone advise? I really do not want my PSN payments to go through a business account.