Usually, if you didn't recieve your In-App purchase, taht means money wasn't deducted from your iTunes account. Apple understands that games aren't always made perfectly, and that sometimes they glitch, and that this may happen when someone is making an In-App purchase. Apple gets complaints about this all of the time, and that's why they set up necessary precautions. If money WAS removed from your iTunes account then you should focus on contacting Apple about the issue, if you have valid proof.