Good luck! A friend of mine sent me this after trying to use a gift card at a Marriott hotel:

"By the way I dropped off the gift certs at the front desk and told them to process them as a deposit on my account.

The next day they called to say they didn’t know how to use them, and I said OK that’s fine I will take 1 night free in the hotel and give me back the certs and I will use them in the next hotel.

GUESS what, they learned how to use them."