In situations where customers are purchasing books and then requesting refunds after a week without providing any reason, here are a few steps you can take:

1. Review Return Policies: Ensure that your return policy is clear and specific regarding timeframes and conditions for book returns. You can consider shortening the return window or specifying that only unused or undamaged books can be refunded.

2. Set Reasonable Return Conditions: If not already in place, you could establish stricter conditions for book returns, such as only allowing returns if the book is defective or damaged. This can help reduce returns without valid reasons.

3. Digital Product Policies: If you sell digital books (eBooks), consider implementing a "no refund" policy after the book has been downloaded or read, as it’s difficult to control access to digital products once delivered.

4. Communicate with Customers: When customers request refunds, ask for feedback. This can help identify if there are common issues with the books (e.g., quality concerns), or if the requests are unfounded.

5. Customer Service: Try to offer alternatives like replacements, store credit, or exchanges instead of refunds. Some customers might accept these options.

6. Monitor Abusive Returns: Track repeat offenders or excessive return requests. If you notice patterns, you may be able to restrict returns from those accounts or set stricter policies for future orders.

Implementing these strategies can help reduce unnecessary returns while still maintaining customer satisfaction.