Subject: Formal Apology for Failure to Credit Payment — [Your Company Name] [Your Name] [Your Title/Position] [Your Company Name] [Your Company Address] [City, State, ZIP Code] [Email Address] [Phone Number] [Date] [Recipient's Name] [Recipient's Position] [Recipient's Company Name] [Recipient's Company Address] [City, State, ZIP Code] Dear [Recipient's Name], I hope this letter finds you well. I am writing to sincerely apologize for an oversight on our part regarding the crediting of payment for the outstanding invoice [Invoice Number] dated [Invoice Date] and the subsequent delay in acknowledging its receipt. We deeply regret any inconvenience or confusion caused by this error and assure you that it is not reflective of the quality of service we strive to provide. [Describe the situation precisely — For instance, mention the details of the payment that were not adequately credited, such as the amount, dates, and any relevant transaction/reference numbers.] Regrettably, due to an internal miscommunication, your payment was not properly credited within our system. We genuinely understand the frustration and dissatisfaction this has caused you and want to assure you that we are taking immediate actions to rectify the situation. To address this issue promptly, we have implemented a series of measures: 1. Investigation: We have launched a thorough investigation to identify the root cause of the error and ensure it does not recur in the future. Our accounting team is working diligently to trace the discrepancy and put in place additional checks and balances to prevent similar errors. 2. Crediting Payment: Rest assured, we have now correctly credited the payment associated with the aforementioned invoice. Our records reflect that the outstanding amount has been successfully applied to your account as of [Payment Date]. If you have any concerns regarding the accuracy or completeness of the credited amount, please do not hesitate to contact us immediately. 3. Enhanced Communication: We understand the importance of clear and continuous communication, especially when it comes to financial matters. To provide you with better transparency, we have designated a dedicated point of contact within our team who will personally handle any inquiries, concerns, or requests you may have regarding your account. You can reach our representative, [Contact Person's Name], at [Contact Person's Email/Phone Number]. They will be able to assist you promptly and ensure the highest level of service going forward. We deeply value our business relationship with you and appreciate your understanding and patience regarding this matter. Rest assured, we are actively taking steps to prevent similar situations from happening again in the future. Once again, please accept our sincerest apologies for the inconvenience caused. We are committed to resolving this issue promptly and restoring your trust in our services. Thank you for your cooperation, and we look forward to serving you with the utmost professionalism and excellence in the future. Yours sincerely, [Your Name] [Your Title/Position] [Your Company Name]