I'm not sure how "suspicious behavior" could be relevant to a seller issuing you a refund. Nor do I understand why a government ID would help with that kind of situation. If they are saying it's because the credit card might be stolen, that doesn't really make sense for a refund. If they're saying the account might be hacked, then again, I can see limiting purchases, but not refunds. Are you sure this was a real email from Amazon and not a phishing email? I'd contact them again to verify, first. Then if you can't resolve it, go to your bank and ask for a reversal of the charge.