Subject: Apology Letter for Accounting Error — Invoice Correction Dear [Customer's Name], I hope this letter finds you well. We sincerely apologize for the accounting error and any inconveniences it may have caused you. It has come to our attention that there was an error in the invoice [Invoice Number], dated [Invoice Date], which resulted in an overcharge on your account. At [Your Company Name], we strive to maintain the highest level of accuracy and transparency within our accounting processes. However, we regretfully acknowledge that an oversight occurred in this particular case, leading to this unfortunate error. Please be assured that we have identified the root cause of this mistake and taken immediate measures to rectify it. Upon a thorough review of your account, we have found that an amount of $[Overcharged Amount] was erroneously added to the invoice. We deeply regret this discrepancy and assure you that this mistake is a complete anomaly within our accounting system. We take full responsibility for the error and are committed to amending it promptly. Thus, we have already processed the necessary adjustment in our records, and your account now correctly reflects the revised invoice. Consequently, the outstanding amount due on your account has been adjusted to $[Corrected Amount]. To ensure transparency, we have attached the revised invoice for your reference. To rectify this unforeseen error, we sincerely apologize for any confusion or inconvenience it may have caused you. Our relationship with customers like you is of utmost importance, and we are genuinely committed to providing you with excellent service. To make amends for the inconvenience, we would like to offer you a [Discount Percentage]% discount on your next purchase with us. Simply provide the discount code "[Discount Code]" during checkout, and the discount will be applied accordingly. Moving forward, we have taken significant measures to reinforce our internal controls and review our accounting processes to prevent such errors from happening again. We value your feedback and encourage you to share any suggestions or concerns you may have, as it enables us to improve our operations and serve you better. Once again, please accept our deepest apologies for the inconvenience caused by this accounting error. We appreciate your understanding and cooperation in resolving this matter. If you have any questions or require further assistance, please do not hesitate to contact our customer service team at [Customer Service Phone Number], or by email at [Customer Service Email Address]. Thank you for your patience and continued patronage. We assure you that we remain fully committed to providing you with the best customer experience. Sincerely, [Your Name] [Your Position] [Company Name] [Company Address] [City, State, ZIP] [Phone Number] [Email Address] Additional Wisconsin Sample Letters for Apology to Customer for Accounting Error: 1. Wisconsin Sample Letter for Apology to Customer for Overdue Payment Error 2. Wisconsin Sample Letter for Apology to Customer for Incorrect Billing Statement 3. Wisconsin Sample Letter for Apology to Customer for Delayed Refund Processing.