Dear [Customer's Name], Subject: Apology for Accounting Error and Resolution Steps We hope this letter finds you well. We are writing to offer our sincerest apologies for the accounting error that occurred in our system, resulting in a discrepancy in your recent invoice. Please accept our apologies for any inconvenience or confusion caused by this error. At [Company Name], we strive to maintain the utmost accuracy in our accounting processes, and this error is an unusual occurrence that we deeply regret. We understand the importance of accurate accounting in building trust and fostering strong relationships with our valued customers like yourself. Upon discovering the error, our accounting department immediately initiated an investigation to identify the root cause and take appropriate corrective measures to prevent any recurrence. We have rectified the issue and are implementing additional measures to enhance our accounting procedures, ensuring such errors do not happen in the future. While we understand that this mistake may have caused you inconvenience, we assure you that no additional charges will be applied to your account as a result of this error. Moreover, we have taken immediate steps to adjust your invoice accurately, and the revised invoice is attached to this letter. To compensate for any inconveniences caused, we would like to offer you [relevant compensation or discount if applicable]. Your satisfaction is of utmost importance to us, and we value your continued patronage. Please accept our sincerest apologies once again for any inconvenience this error may have caused. We greatly appreciate your understanding and patience while we resolved this matter. If you have any further questions or concerns, please do not hesitate to reach out to our customer service team at [customer service phone number]. We remain committed to providing you with exceptional service, and we sincerely apologize for any negative experience that may have resulted from this error. We assure you that we have learned from this situation, and going forward, you can expect improved accuracy and diligence in our accounting processes. Thank you for your ongoing trust and support. Yours sincerely, [Your Name] [Your Title/Position] [Company Name]