Other Car Rental Programs/Partners (ie. Alamo, Enterprise, Sixt) - Alamo- need to modify res, but rates have skyrocketed

I have an Alamo reservation for an upcoming trip to Maui. Because of multiple airline bankruptcies, my dates have changed slightly. We're actually there for a day less.

When I go to Alamo's site to try and change the reservation, removing one day ends up costing several hundred dollars more. I've never saved these changes and still have the original reservation.

My thinking was, I would show up with the paperwork and count on them honoring the rate. The problem I see with this is, I'll actually be showing up a day later.

Will they charge me a "no show" fee if this doesn't work out. I know I didn't give them a CC # when I made the reservation, but I am a Quick Silver member and cannot remember if I gave them a number at that time.

Any other ideas on how I can modify the dates without getting ripped off?

Thanks for the help!

Try removing the rate code in your current reservation. This sometimes works due to the rate code you are currently booked in may be sold out.