Hello 🙂 A few problems have been appearing with goodybags. Please see this thread: Goodybag issues
Ask a agent http://giffgaff.com/support/ask
Please be aware if you encounter the problem off the invalid date in while trying to contacting an agent, then the way around this is to choose sim services from the drop menu and then no services from here you will be able to insert your information.
I hope you get this matter fixed really soon, please mind the agents cab take up to 24 hours to get back to you.