Dominoes Gift Cards No Expiration Date - Expired!

I recently tried to use three 5$ Dominoes gift cards from MyCokeRewards. They were rejected as expired, even though they said they had no expiration date. I called Coke to find out why. They were unable to find a record of my ever purchasing these gift cards, so can't help me, because I didn't save the email or order numbers for the gift cards. If I had known that was the only way to track them and that I would have a problem, I would have saved them. I only have the gift card numbers and pin numbers, which are apparently useless for tracking. I had a fourth gift card (purchased at the same time) with a balance of 1.38 on it that worked. Why did that gift card work when the 5$ unused gift cards did not work? I'm extremely disappointed that Coke has made this great program so hard to use. Now you need "status" to purchase gifts, on top of points.