the dreaded answer:
Dear sir,
Thank you for your patience while we investigated why your account was disabled. I have reenabled your account. Your account was disabled because the purchasers of the three iTunes Gift Certificates redeemed to your account (listed below) have refuted the charges with their credit card companies.
XM7CQPX4RXK8GWBP
XMCMFP5Q3XSZ4B8M
XM7T54MCMLV35X7S
When charges are reported as unauthorized, any remaining iTunes Store credit from the disputed purchase is considered unauthorized and is removed from the account.
If you purchased the iTunes Gift Certificate on an auction website, it may have been part of a fraud claim. You may want to address the issues with your purchase to the seller, or use any dispute resolution service provided by the auction website or other remedies that might otherwise be available to you.
If the iTunes Gift Certificate was purchased from Apple, the buyer will need to contact his or her credit card company to discuss the disputed purchase.
You can now resume purchasing from the iTunes Store, but the funds from the fraudulent iTunes Gift Certificate will not be made available to you.
Sincerely,
Matt
iTunes Store Customer Support
http://www.apple.com/support/itunes/wwI work Monday to Friday, 6 AM to 3 PM