iTunes Store Glitch/Bug? I got Free Music!

[J03]

Hey guys. So, I got a £15 iTunes Store voucher. Last night, I bought 13 songs. Should have cost me £10.27, right? It did at the time. This morning, I logged in to the store. I still have the 13 songs I bought, but now i have £8.68!!!

What's going on there?

 

[DJ-CHRIS1]

Try to buy something, it will than update your proper balance. Their's a problem with balances on itunes. For example mine will say I have $15 left, but i go to buy 2 songs and not enough money