Nice to meet you. I send you a picture, as you can see on that , I checked in on a GVB at Amsterdam Amstel station, but I checked out on NS at Amsterdam Slot. station, so there was no checked in on NS. So that directly cost me 10 Euro. It was my mistake for going through the wrong door, we shouldn't check in by GVB as we got on a train.
Wish you can help me for this stituation, thank you so much.
Beste antwoord door Thom
It is in English.