Seeing how you paid for the WBC seat, I would personally, try to get what you originally asked for which I think is fair.

I would contact them and say thank you for the offer but I really feel that I should receive what I paid for. yes you paid for a safe flight, but that is what the coach fare was, a safe flight, the difference in fare was to sit in WBC which offers nicer amenities of which one of them is the entertainment system. Maybe you could come up with a formula as to how you derived at the 400.00 or 25K mile amount to justify your request.