Phone call number one said that the issue was with their website and to try again.

Phone call number two said website will not accept US based credit cards.

I tried both Visa and Mastercard, neither would take. This attempt to book and pay for a ticket was not my first time in not being allowed to complete the reservation. The first time was several months ago, for this upcoming trip in July, with the same error message regarding problems with my credit card.

I have no idea which is the right answer.