I live in Australia and accidentally bought a US $20 Xbox gift card. It's my first time buying one so I wasn't really sure what to do. To make matters worse, I've already redeemed it so it's stuck in my account. I've tried changing my locale online to US but when I try purchasing it shows up with AU currency and I'm not sure if it will take money from the gift card or my credit card.
What are my options? My 360 is so old I wouldn't even mind doing a mod so that the money doesn't go to waste