As a Mac owner, I’ve found Apple to be not very forthcoming when there are problems and unreasonable at times with their policies. This seems to be the tact there are taking with fraudulent iTunes gift cards, whether they were generated by people who hacked the algorithm or bought with stolen credit cards. If you use such a gift card on your iTunes account, you risk Apple closing your account and losing access to all your purchased music. The best idea is to stay away from iTunes gift cards on the secondary market. (article)