Subject: Request for Refund of Duplicate Payment — [Your Name] [Your Name] [Your Address] [City, State, Zip Code] [Email Address] [Phone Number] [Date] [Recipient's Name] [Recipient's Designation] [Company Name] [Company Address] [City, State, Zip Code] Dear [Recipient's Name], I hope this letter finds you in good health and high spirits. I am writing this letter to bring to your attention an oversight that occurred during my recent billing cycle with [Company Name]. I have discovered that I inadvertently made a duplicate payment for [Service/Product], and I kindly request a full refund for the duplicate amount. To provide you with the necessary details: 1. Invoice Details: — Invoice Number: [Invoice Number— - Invoice Date: [Invoice Date] — Payment Date: [Duplicate Payment Date] — Duplicate Payment Amount: [Duplicate Payment Amount] — Payment Method: [Payment Method] 2. Supporting Documents: — Payment Receipt: [Attach a copy of the payment receipt for the duplicate payment] Upon reviewing my financial records, I was alarmed to find that a duplicate payment was processed without my knowledge. It was unfortunate that this error occurred, as I pride myself on being diligent with my financial responsibilities. However, I believe such situations can be resolved amicably, given the excellent track record of your company in promptly addressing customer concerns. I request immediate attention to rectify this issue by initiating a refund of the duplicate payment amount to the original source from which it was made. I would greatly appreciate your cooperation in expediting this process. Please confirm the refund initiation and provide an expected timeline for the refund to be processed. Should you require any additional information or if there are any discrepancies in the details mentioned above, please do not hesitate to contact me via the provided email address or phone number. I believe that swift reparation of this matter will strengthen our relationship as a valued customer. Thank you for your attention to this matter, and I look forward to hearing from you soon. Sincerely, [Your Name]