I think you might find that you would need to contact sony regarding this issue because it's to do with your PSN ID and not SE. If you ask them Sony may refund you so you can then purchase on the PSN ID you want to, I've never had to do this before so I'm not sure whether they can. I don't know whether they can do a transfer to another PSN ID but if they can't, again something I've not had to deal with before, then there's no harm in asking for a refund.

EDIT: Oh and I forgot to mention, when you contact Sony regarding this, they should be able to help you out with the difficulties in purchasing FFXIV bundle on your PSN ID.