Dear XYZ,

I am writing to express my dissatisfaction with the service I have received from your website. I recently placed an order for the most recent edition of [Book Title], but despite the promised delivery date of [Delivery Date], the book has not yet been delivered.

I've been a devoted customer of your bookstore for many years, and I've always been pleased with the calibre of service provided by your employees. However, the delay in delivery of this book has caused me considerable inconvenience, and I am extremely dissatisfied with the service provided by your website.

I'd like to emphasize the urgency of this matter because I need the most recent edition of this book for a forthcoming project. Please investigate this matter and provide me with an update on the status of my order as quickly as possible.

I hope this issue can be resolved quickly so I can continue to make future purchases at your bookstore.

Thank you for your consideration of this issue.

Sincerely,

ABC