There is an issue with your EA account which will prevent SWTOR purchases

@5797550 

To fix the account You need to reset the password on the linked EA account that account uses a Rambler.ru email address

use this link to reset the password then login on that EA account to fix the swtor account for purchasing

for future purchases, use incognito mode on chrome initially if you purchase on swtor.com to be sure browser cache and cookies is cleared