What's wrong with this gift card?

I have a Panera gift card that I've been trying to use and I've gone into a couple different stores now and after ordering food go to pay with the card. Both times the cashier says "we don't take that type of card" and I'm like "What do you mean, is this not a Panera? Is this not your company's name and logo?". But when I press further they cashier has no idea as to why that card isn't taken. Obviously they know about the problem from the way it sounds and I wasn't the first one.

I think there's only $15 on the card (range says $15-200) but no way to know for sure, no service number to call, and the brand "FastCard" seems insanely difficult to get a hold of, if it even exists at all. Has anyone else had a similar experience?