Be careful with which credit or debit card you use. When I got a new card not too long ago, they were very strict on international transactions. They wouldn't let some of them go through until I called support and was pretty angry with them for controlling what charges I made when they were legitimate and intentional without any input or feedback from me before declining it. After I spoke with them, they put it onto their computer system not to do that to me anymore, and ever since I have been able to use the card for international charges. So you might want to check on it and see if that is the reason why. If not, I would try a different card and if it still doesn't go through, contact them directly. Also, if there are any pending charges that do not drop off of one or more cards, be sure to dispute the charges so you don't pay for the same thing twice.