I have 3 credit cards, AMEX VISA and Master, all of them are assuringly valid in Japan, but when I tried to switch country back to Japan, it always said "the card you entered is invalid." whichever I used. I don't have any unpaid bills or else, just changed the country to update some apps not displayed in Japan's app store.
Anyone can give me an explanation or how can I get out of this?
Thanks in advance.