This is a scary story indeed. I also think VictoriaP's advice is the best, although I myself would find it extremely difficult to keep calm under such circumstances.
It's also food for thought for the future. I have tried to avoid buying digital content that I could not liberate, but it's harder to do in some instances. I'm thinking about all the stuff on my iPad, for instance, and I'm a bit scared. Although I don't think Apple has a history of wiping out stuff from customer's devices, they could do it I'm sure, and with the apps I would also lose my content (created by me). A reminder to make device-independent backups regularly.
I do hope you manage to sort this out with Amazon.