Misleading offer: 10 euros for the purchase of a gift card of 50 euros

I wanted to take advantage of the following offer: "Buy 50 euros or more of the check (s) -cadeau (x) between October 20 and November 5, 2014, receive a promotional code (which will be sent to you between 6 and 8 November 2014) which you can benefit from 10 euro discount on your next order of 50 euros or more of articles sold by Amazon at Amazon.com. "
I bought a gift card for 50 euros. However despite my queries "cat", by telephone and e-mail I always expect my promotional code ...