Gift card confusion

I have bought a Mia by Tanishq gift card, for 30k which I purchased today from Woohoo. It's an offline gift card, I wanted to buy a gold coin, no where in T&C it was given that gold coins cannot be purchased using the gift card. I have already mailed the Titan customer care

The gift card has validity for 180 days.

I don't have a need for the jewellery purchase, how can I get out of the situation ?