Our flight CUR - AMS was delayed for 3 hours yesterday and all passengers received a delayed flight package including:
1) a coupon for 2,000 FD miles OR € 10 food / beverages at participating airport vendors OR € 15 discount on tax-free on-board articles; and
2) a coupon for a € 50 discount on a ticket on KL, NW or (some) affiliates.

Now there is a lot of small print on the back of the € 50 ticket discount voucher, and it says that I need to contact KLM by phone or go to a KL ticket office to make my reservation using the discount.
Well, phone reservations and reservations at ticket office are more expensive than Internet reservations, so am I right in assuming that I will already loose part of the € 50 discount? Any ways around this?