California Sample Letter for Refund for Duplicate Payment: Dear [Sender's Name], I am writing to bring to your attention an error regarding a duplicate payment made to your company. On [date], I made a payment of [amount] for [product/service] through [payment method], but upon reviewing my records, I discovered that the payment was inadvertently duplicated. I kindly request that you investigate this matter and process a refund for the duplicated payment as soon as possible. Attached to this letter, you will find a copy of the relevant payment receipt for your reference. The transaction ID for the duplicated payment is [ID]. I understand that mistakes can happen, and I hope we can resolve this matter promptly and amicably. Please ensure that the refund is credited back to the original payment method, [method]. I request that you confirm the completion of the refund via email or through a written response sent to my address [address]. If there are any further actions or documentation required from my end to facilitate the refund process, please let me know promptly. I appreciate your attention to this matter and your cooperation in resolving this issue. I value the business relationship we have had so far and hope that this incident will not adversely affect it. Thank you for your immediate attention to this matter. Sincerely, [Your Name] [Your Contact Information] Different types of California Sample Letters for Refund for Duplicate Payment may include variations such as: 1. California Sample Letter for Refund for Duplicate Payment — Insurance claim 2. California Sample Letter for Refund for Duplicate Payment — Utility bill 3. California Sample Letter for Refund for Duplicate Payment — Online purchase 4. California Sample Letter for Refund for Duplicate Payment — Medical bill 5. California Sample Letter for Refund for Duplicate Payment — Rent payment These variations depend on the specific context in which the duplicate payment occurred, such as the nature of the service or product, the industry involved, and the payment method used.