I have surfaced this on a different topic but I believe this deserves a topic of his own.
I am to travel soon abroad and went looking for ticket on your website NS International and book them there. There you have option to add Discount card here in Netherlands and abroad, in my case I have free travel in Germany and added this option on your search request. At the same time, as I am travelling with my 5 year old kid, added his Free Child option as well.
After doing this, I found out if I book together with my kid, the ticket price is twice as I would book for myself. The discounts are void when I add my kid. This to me is very odd and not fair.
Anxious to know what is happening, I went straight to the station and asked about this. They seem surprised too but they worked it out and I received the fair price I deserve.
The request here is, most people do not know about this and are not sure what to do, and probably end up paying the full amount. Please fix this as soon as possible on your website, because otherwise, you are ripping people off.