Error 401, cannot add crysta

Holy shit, this is bad.

I’ve never had this problem before. My credit card used to be fine for paying SE when I purchase Crysta. But since yesterday, my bro and I found out that none of our cards works now. It always gave us error 401 message:

An error has occurred.
Please confirm the status of any relevant options and then try again.
For details, please contact the Square Enix Support Center.
(Error code: 401)

I searched on Google and so many threads (old ones) came up. A lot of people were complaining about error 401 and there seems like there’s no way to fix this.

PayPal is already gone from Mog Station, and now my credit cards too?! I’m in a big trouble now. :(