hello, my friend has the same problem, he didn't change credit card but for some reason he can't use it now to pay his monthly fee and get error: 406, I tried to pay with my card which works perfectly in my account and get same error so it has nothing to do with bancks and credit cards. Was looking into forums and found a 90 pages thread and found a way buying crysta using ultimate gamecards, bought an international ultimate gamecard ($15.00) and nothing! seriously, chat support 1st said talk to your bank, we did it and our bank says they dont have any issue, we talked to chat support again and they say we should try ultimate gamecard... why is it so hard to pay, when will SE realizes this problem is a serious matter that needs real attention.