Subject: Apology for Accounting Error — Your Trust is Our Priority Dear Valued Customer, We hope this letter finds you well. We regret to inform you that an unfortunate accounting error occurred in our records, causing discrepancies in the recent billing you received. We deeply apologize for any confusion or inconvenience this may have caused and assure you that we are taking immediate steps to rectify the situation. At [Company Name], we always strive for accuracy and transparency when it comes to handling our customers' accounts. Unfortunately, this time we failed to meet the high standards we hold ourselves to, and for that, we sincerely apologize. Upon identifying the error, our dedicated accounting team initiated a thorough investigation to understand the root cause of this discrepancy. After thorough analysis and review, we discovered that the error resulted from a technical glitch in our software system during the monthly billing cycle. Rest assured, we have taken the necessary measures to prevent such incidents from occurring in the future, including implementing enhanced monitoring protocols and conducting frequent system audits. In order to rectify the mistake and ensure your invoice accurately reflects the agreed-upon terms, we have already initiated the correction process in our system. The revised invoice, along with a detailed breakdown of the adjustments, will be sent to you within the next 48 hours. Additionally, we will be verifying and reconciling the affected accounts to ensure there are no further discrepancies. We understand that this unfortunate incident may have caused inconvenience and confusion for you. We value the trust you have placed in us and want to assure you that we take this matter very seriously. Our customer service team is ready to provide any assistance required and address any concerns or questions that you may have. Please do not hesitate to reach out to our dedicated helpline at [Customer Service Number] or reply to this email directly. We sincerely apologize for any inconvenience caused and are committed to making this right. Rest assured, this accounting error is an anomaly, and we will do everything in our power to prevent similar incidents in the future. Thank you for your understanding and patience in this matter. We genuinely appreciate your continued support and will strive to exceed your expectations going forward. Once again, please accept our humble apologies. Sincerely, [Your Name] [Your Position] [Company Name]