you might as well post what they say, but it's pretty obvious the different scenarios. First, the ad specifically says beauty Boutique Gift Card. So the ad is intended to be for the Boutique only. If the card actually works in the regular store (which it did before) then your calling is going to do a few things. It will alert them that more people are looking to buy these cards and then use on regular items. Their response in store can be to either start programming the cards to only work on boutique (i think unlikely), send memo to stores to only allow on boutique items, or stop or lower the promotion. It's better to just let the promo happen, ,then go and buy a card and see if it works. Somebody here will be able to buy the card and will take the chance and let everyone know.
Seriously, let everyone know what they said.