From the Kindle users guide, section 5.4
RETURNING AN ITEM
All of your Kindle Store purchases present an order cancellation feature at the time
of purchase in case you change your mind or made a mistake. Just select “Purchase
by Accident? Cancel this Order” on the order confirmation page. If you are a U.S.
customer, you can also contact Kindle Support using Amazon’s Click-to-Call service on
the Web at: http://www.amazon.com/kindlesupport
For customers outside the U.S., Kindle Support can be reached via e-mail at:
kindle-cs-support@amazon.com or by phone at 1-206-266-0927(charges will
You can access it here.
http://www.amazon.com/gp/help/custom...deId=200317150