Rob, this is from their Terms and Conditions:
Shipping orders outside of the United States
We can ship our products throughout the world using air and ocean transportation services. We evaluate international orders from all new customers to determine whether we can accept them.
Does that mean you've failed the evaluation process?
Their response doesn't make sense to me either; they're saying they won't ship within the US?? Really?? And if you've ordered before then surely you're already an established customer? I think that's just a fob off set of excuses.