Once the code stopped being accepted for new rentals, I emailed National to ask if they would continue to honour our confirmed reservation. Here is their email reply:
Thank you for contacting National. My name is Undra, and I would be happy to assist you with your inquiry. I've located your reservation XXXXXXXXX, and I do see that we will honor the KLM discount. Because the reservation has already been booked and confirmed, we will honor all discounts applied. Please feel free to contact me again, if you have any additional questions or concerns. Thank you for choosing National. We do appreciate your business.
Regards,
Undra with
National Rent-A-Car
I always prefer emailing to calling, because then I have a written record of their response. I have printed their email reply and will bring it with us, just in case we have any issue at the counter.