I've had that happen a couple times. Both times, Restaurant.com was very responsive. Instead of getting a refund, I accepted a credit that I could use toward any other restaurant gift certificate. I waited until the first of the month (when they make new certificates available) and got one of the ones that sells out pretty quick. Considering I had bought my original certificate with a coupon (and the certificates for the new restaurant always sell out before coupons become available) I was quite happy.