Traintickets from Amsterdam to Frankfurt

I have bought ICE (fast train) traintickets from Amsterdam to Frankfurt for 2nd of October, but plans have changed!
The people from the train can't refund them or something, so I'm hoping I can help somebody to them!

Let me know fast,

Regards,
Lieke

How did you buy them?

I ask because if you bought them online the ticket inspector on the train will want to see the printout of your ticket plus the credit/debit card you used to book the ticket. If you can't show the card the booking is invalid.

It's already arranged!

and I paid them in advance, no credit card stuff, so shouldn't have given any trouble...

try marktplaats.nl then tciekts/then trein-bus/ thats THE place here in Nl we use to sell any unused-inwanted stuff like this. usual going rate is half price/but its too late for this ticket/if someone reads this for any later queries. also/if lucky/a good place to score cheap tickets for yourself.