There is a no refund policy for the Amazon Bestseller program at any time once you have made your deposit.
There is a tremendous amount of work that goes into getting your book ready for the launch as well as the hours spent doing the launch and getting your book seen by hundreds of readers (that amount varies but typically is in the hundreds and sometimes thousands).
As stated on the Earnings Disclaimer page, we don’t make any guarantees of sales of your book once we do the free book launch. All books take on a life of their own and it is impossible to foresee if a book will sell or not on Amazon. Our one and only goal is to get your book to the top of the bestsellers list so that people can now “find” your book and so that you can now leverage your bestseller title. The bestsellers lists are the most searched lists on Amazon and once your book is on that list people can now find your book and decide whether or not to purchase it.