[Your Name] [Your Address] [City, State, ZIP] [Email Address] [Phone Number] [Date] [Recipient's Name] [Recipient's Address] [City, State, ZIP] Subject: Apology for Not Crediting Payment Dear [Recipient's Name], I hope this letter finds you in good health and high spirits. I am writing to apologize for the oversight in not crediting the payment of [Amount] made by our company, [Your Company Name], on [Payment Date] for the invoice [Invoice Number]. First and foremost, please accept my sincerest apologies for any inconvenience caused as a result of this oversight. As a responsible and professional organization, we understand the importance of promptly acknowledging payments and their impact on the smooth functioning of businesses like yours. We deeply regret this lapse on our part and assure you that steps have been taken to rectify the situation. Upon realizing the error, our accounting team immediately reviewed our records and confirmed that the payment for the aforementioned invoice was indeed made. Their investigation revealed that the oversight occurred due to a technical glitch in our payment processing system, which led to the non-crediting of the payment. We have since identified and resolved the issue to prevent any recurrence. Coming to the actions taken to rectify this oversight, our accounting department has already initiated the process of crediting the payment to your account. The payment should reflect in your records within [Timeframe]. Additionally, we would like to waive any associated late fees or penalties that may have resulted from this incident. We understand that trust and reliability are crucial components of maintaining a positive business relationship, and we take full responsibility for our mistake. Please be assured that we place tremendous value on our association with your esteemed company and will do everything in our power to prevent such situations in the future. To convey our remorse and commitment to making amends, we would like to offer you a discount of [Percentage/Amount] on your next invoice with us as a gesture of goodwill. We believe this will help demonstrate our dedication to your satisfaction and address any inconveniences caused by the non-credited payment promptly. Once again, please accept my sincere apologies for the oversight. We value your business and hope that you will accept our efforts to rectify this situation. If you have any further questions, concerns, or require additional assistance, please do not hesitate to reach out to me directly at [Your Phone Number] or [Your Email Address]. Thank you for your understanding and patience. We look forward to continuing our partnership with you and providing exceptional service in the future. Yours sincerely, [Your Name] [Your Title/Position] [Your Company Name]