Did you use the same email address to make the Guest Purchase as you use with your actual account?
This is often the reason that fails. If so... Try temporarily changing your email address on your ebay account to another one, log out, clear your browser history and restart your computer to clear all your cookies, and click that email again and see if it works. If not.....
You used your credit card to pay? You can file a chargeback with the credit card company. Have all your information ready when you call.
When was it supposed to arrive? There are outstanding delays with imports from China right now.
