Hey @clearsky! Thanks for writing.
Have you tried redeeming the code from an incognito window on a desktop PC using this link? If that doesn't help, we'd suggest you get in touch with the store you bought it from and double check with them if the gift card was properly activated at the checkout.
In case it was and you're still having issues, our customer support team will be glad to help you out with this one. You can get in touch with them via email, Twitter or Facebook. They'll reply to your message as soon as possible.
Hope this helps. Have an amazing day 🙂