Subject: Urgent Follow-up Regarding Duplicate Order: [Order Number] [Your Name] [Your Address] [City, State, ZIP] [Email Address] [Phone Number] [Date] [Vendor/Supplier Name] [Vendor/Supplier Address] [City, State, ZIP] Dear [Vendor/Supplier Name], I am writing this letter to bring to your attention a pressing matter regarding a recent order I placed with your esteemed company. On [date of original order], I placed an order [order number] for [products/services] and received confirmation of the order via email. To my surprise, upon checking my records, I discovered that the same order [order number] had been inadvertently duplicated on [date of duplicate order]. Considering this duplicate order, I would like to clarify the following and kindly request your prompt assistance in resolving this matter as soon as possible. 1. Confirmation of Duplicate Order: Please validate the existence of the duplicate order [order number] and provide me with any relevant documentation regarding this order. 2. Order Cancellation and Refund: Kindly cancel the duplicate order [order number] immediately and process a refund for the total amount paid. I would appreciate your promptness in addressing this matter to avoid any unnecessary delay. 3. Communication Acknowledgment: Please acknowledge the receipt of this letter and confirm that the necessary steps have been taken to cancel the duplicate order. I kindly request that you provide me with a timeline to expect the refund. I fully understand that mistakes can happen, but it is crucial that this issue is resolved in a timely manner to prevent any potential complications. Furthermore, I trust in your professionalism and commitment to excellent customer service, which inspired my confidence in choosing your company for my procurement needs. Please update me regarding the progress of this request within [reasonable timeframe, e.g., 5 business days] from the date of this letter. You can reach me at [phone number] or via email at [email address]. I appreciate your immediate attention to this matter, and I look forward to a satisfactory resolution. Thank you for your understanding and cooperation. Yours sincerely, [Your Name]