Personally speaking, I'd contact Sony Entertainment's Live Chat and ask them about it. At the very least if they can't give you an answer, they'll most likely be able to point you to whom ever can.

Or if you're feeling adventurous and don't mind taking the risk, you can try Square-Enix Members > Profile Settings > Linked Accounts for a quick round of readjusting which SE account is linked to which PSN account.

...You do so AT YOUR OWN RISK.