Nowhere near €600 at issue here, but I recently took the train for work and had to reschedule my train. The train I took was $22 cheaper. Here's the catch. The company had booked a nonrefundable ticket. To work around this, the agent gave me a new ticket, plus a $22 "voucher" (not a rebate, but essentially a $22 off coupon) that could be used on a future ticket. I would gladly get reimbursed for the full value and give the voucher to my company, except that it's in my name! In the end I decided to get reimbursed for [cost minus $22] and I guess I'll figure out what to do with the voucher later.