If you have a limit on your card, which most cards do, did you tell your bank you would trying to make a large purchase that day or set a higher limit for a specific amount of time? That has got me before.
Also, many fraud automated calling systems will not call outside of certain hours, I had that happen before too where I went to make a purchase but could not and received no call until the next day.
Its also possible I guess the payment was refused due to the product being sold already.