This is outrageous. For company valued at 10 billion dollars, I would think that they would care for their customer and acknowledge the obvious programming error that your computer system doesn't accept the coupon on your booking site. Also, that no one has the power to over ride "the system" to credit my coupon is not credible. Someone has that ability, who is that person?
I am no longer in your "community", as it is clear that your company's objective is purely monetary and takes no heed at all to valid complaints.
I intend to take my complaint further.