The credit card information can not be updated
Check your playstation Network account information, and then contact technical support for assistance.
Does anyone know about that problem on PSN?
First it said my credit card informations was wrong, but they are not wrong, and now the new message. So I can't buy the DLC right now!
This happened to me too, but later I found out that my Credit card won't work for PSN. I ended up buying a PSN Card for it. The weird thing is that I've used the same card to buy other stuff before. Btw, the error code means your account has been locked for 24 hours, because you were entering too many invalid info.