when i try to transfer a NS bus(from Amsterdam Sloterdijk to Haarlem) at Amsterdam Sloterdijk, I double checked at Amsterdam Sloterdijk. And then I get off at Haarlem i also check my ov card.
Then i get an email from NS, which is shown below. I click the link NS Klantenservice, but I didn’t find something useful. So what do I need to do now?