Thanks, everyone. rae, I would be totally agreeable to mailbombing STA if they don't come through. I just posted the situation on their Facebook page. That their customers read. They could just delete my post, so I'll need to check back. And today I'll also give the credit card company a call to see what they say.
CocoLion, I understand that a store credit is better than nothing and I would have accepted it (maybe still would). But the amount of time passing without a response is irking me at this point. I thought it might be Sandy-related? But I think their HQ is in Boston, which didn't have any damage to speak of. Plus my first email to them went out about four days before the storm hit.
(Now I'm venting. Back when my daughter was about ten, I bought a birthday cake for her from a local bakery that made high-quality baked goods. For some reason the cake had gone bad on the inside (it looked fine when they sold it to me, of course). I brought it right back and the owner ran to the cash register and gave me my money back and extra. And she stuffed this box full of cookies for me to take with me. She couldn't have been more apologetic (and I was being very nice and understanding--no confrontation whatsoever). Of course I continued to buy things from that bakery; it was just this flukey thing that had occurred.
If I get a store credit from STA, that's the last time I'll be going to one of their stores.