User Activity

I listed all my items with the "No International Shipping" option checked but yesterday someone from Australia purchased one of my item and requested the total price. How is this possible? I thought they would be blocked from buying my item. And the ...
A new buyer (no feedback) has won an auction from me last thursday, but still hasn't payed. I sent him a message offering assistance if needed to pay through Paypal, but I got no answer yet. What should I do ? I have the possibility of sending a seco...