Subscription problem

Greetings,

I am trying to add a subscription to my account, but I have been unsuccessful, without given a proper reason as to why. Granted, I live in Greece where things are... unusual, to say the least, but anyway here's what I tried so far:

• Tried my (Mastercard) debit card that I use to buy things from Steam, or Humble Bundle, or other companies abroad. It said that "We're sorry, but we can't perform transactions to this credit card. Please load a different one."
• Tried five other credit or debit cards, including Visa, Visa Debit and American Express. I was given the same error as above, note that the bank accounts linked with those cards are certain to have more than enough the amount required to subscribe.
• Tried my PayPal account with my debit card. It said that there was an error and I should try again later, however my bank was charged about .90 euros or so. Paypal itself said that the payment was "Denied" (a not-so-thorough search of what that meant revealed that the payment was denied by the receiving party, not my bank).
• Tried different browsers (Firefox, Chrome, Internet Explorer).
• Tried different computer.

The outcome was the same however, I was unable to add a subscription to my account. What can I do at this point to subscribe to the game? A 60 day prepaid card is something I want to avoid, not that I didn't try. Greece does not have these though and amazon requires you to live in UK to purchase one, not to mention that they are quite more expensive than a normal subscription (that I used to have about up to 11 months ago or so with my older and obsolete debit card), pricing at about 17 euros/month.

Thank you for your time in advance,

vagg

P.S.: Oh I forgot to add (this is my EA account, not SWTOR account, didn't notice!) my SWTOR account is Krildor.