Originally Posted by ArnoldB

Our trip is to Rotterdam and our main goal was to do the full-day (10:30-17:30) Maasvlakte harbor tour by operator Spido. They wrote us by mail that this tour is available on Tuesdays and Saturdays and we booked the flights according to that (Friday to Sunday). Turns out they gave us wrong information and it is actually Tuesdays and Sundays, which is obviously not compatible with what we booked (return flight Sunday 17:15) and now I'm desperate with damage control. Rebooking to Saturday-Monday (Evening) is seemingly also not an option because the evening flight on Monday is somehow not available for rebooking, even though it can be selected when making a completely new booking.