in the past I made several purchases of MS points and Gold membership using my credit card. Suddenly in the past few weeks when I try to purchase MS points using the same card I keep on getting the message that my card cant be authorized (no error code). I´ve checked all the things mentioned in the stickies, called my bank (no problem with the card), called Xbox support and tried to use another valid credit card - no success. I´m 100% sure that the problem is not my card - I use it regurarly to purchase things on several websites without any problems (except Xbox). I also checked Microsoft billing site - according to this site, the card is valid and I have no debts.
(I have Czech account, Czech card and I´m connecting from Czech republic.)
I´m running out of ideas, can anyone help?