I used a day ticket for my travel from Amsterdam schipol to Groningen. But unfortunately, there was a train disruption on the route and I had to get down at lelystad centrum to switch platforms to take another train. During switching stations, I had to go through the doors that need ov chipkart to go out and my QR code from the day ticket did not work on these machines. So, I 'çhecked out' to switch from platform 3 to 1. But I was charged 12 euros for that. I think it is not fair to charge money for just switching from one platform to another in the same station. What is the procedure to ask for a refund?
I have a NS flex subscription and I did not see any possibility of applying for a refund in my homepage. I could only write a comment. It says the amount will be corrected, but it was not refunded on my recent invoice. What should I do?