[Your Name] [Your Address] [City, State, ZIP] [Email Address] [Phone Number] [Date] [Recipient's Name] [Recipient's Address] [City, State, ZIP] Subject: Letter Regarding Late Payment and Denial of Discount Dear [Recipient's Name], I hope this letter finds you well. I am writing to discuss the late payment of my recent invoice and the subsequent denial of the discount that was initially agreed upon. As a loyal and longstanding customer of [Company Name], I have always valued the professionalism and quality of your products/services. However, I was disappointed to discover that my payment for invoice no. [Invoice Number] was received after the due date, leading to the forfeiture of the agreed-upon discount. [Optional Paragraph: Provide any relevant background information or reasons for the late payment, such as unexpected financial difficulties or a delay in receiving my own client payments.] I understand that timely payments are crucial for the smooth operation of any business, and I accept responsibility for the delay. Nonetheless, I believe an exception could be made considering my history of prompt payments in the past and the value I bring as a loyal customer. This unfortunate situation was an anomaly and not indicative of my commitment to honoring our business agreement. I kindly request that you reconsider your decision to deny the discount and agree to apply it to the outstanding invoice. By doing so, it would not only demonstrate your understanding of my situation, but it would also reinforce the mutual trust and partnership we have maintained over the years. To expedite the resolution of this matter, I have attached the proof of payment for the invoice in question. It clearly shows that the payment was made shortly after the initial due date, with no intention of disregarding our agreed terms. I hope this will serve as evidence of my commitment to rectify the situation promptly. I sincerely appreciate your attention to this matter and your consideration of my request. Furthermore, I value our business relationship and genuinely believe that an amicable resolution is in the best interest of both parties. Should you have any further inquiries or require additional documentation, please do not hesitate to reach out to me. Thank you for your time and understanding. I am looking forward to your positive response and the opportunity to continue our prosperous business association. Yours sincerely, [Your Name]