Not fair Amazon.com

Placed an order for an item after checking that it could be shipped to South Africa. Paid in full with shipping charges and saw the item had been dispatched. After checking after a couple of days, to my surprise, the order had been cancelled on the Amazon website. I enquired and was advised that the item could not be shipped by the supplier "Sharper Edges". I was advised that I would get a refund. So be it. However the refund was only for the item and not the shipping charges which I believe is unfair as I had checked that the product could be shipped to South Africa. Contacted Amazon and they offered me a promo in place of the shipping charges. This is a matter of principle and they could do the same for the promo offering.