flagging it with support for investigation, however if this was the case then paypal would have no issues using the card.
I do know debit cards can be rejected for subscriptions, as EA dont like debit cards
only other option apart from use a different payment method is to install via steam and purchase on steam, they are a totally different merchant see https://help.ea.com/au/help/star-wars/star-wars-the-old-republic/swtor-on-steam/
shouldnt but need to check pricing your self
be sure to install via steam and play a character for a minute and log out to be sure accounts are linked prior to purchasing
