Subject: A sincere apology for not crediting your payment from a prompt payer Dear [Recipient's Name], I hope this letter finds you well. I am writing to offer my heartfelt apologies for an unfortunate error on our part regarding the crediting of a recent payment you made to us. As a company dedicated to maintaining the highest level of professionalism and customer service, we deeply regret this oversight and assure you that we are committed to rectifying the situation promptly. At [Company Name], we strive to provide exceptional service to our valued customers like yourself. Your prompt and dutiful approach to settling your dues has always been highly appreciated by our team. Therefore, I understand the frustration and disappointment you must have felt upon discovering that your payment was not correctly credited. We take full responsibility for this oversight and will act swiftly to rectify the situation. Our finance department has been alerted, and they are currently investigating the matter to determine the cause of the error. Rest assured, we are committed to uncovering any internal process deficiencies that may have led to this lapse in our system. In the meantime, I wanted to assure you that your payment has now been credited to your account correctly. We understand that this error may have caused inconvenience and possible concern regarding your account status. We apologize for any undue stress or inconvenience this may have caused, and we want to assure you that your satisfaction remains our highest priority. To demonstrate our sincerity, we would like to extend a gesture of goodwill to compensate for the inconvenience caused. We have arranged a [discount, voucher, or gift] that you can avail yourself of during your next purchase with us. Our team will be in touch shortly to provide you with the necessary details. Once again, please accept my sincerest apologies for this error and any frustration or inconvenience it may have caused you. We appreciate your understanding and patience throughout this process. Rest assured, we are taking immediate measures to prevent such errors from occurring in the future. If you have any further questions, concerns, or require additional assistance, please do not hesitate to contact our customer support team at [phone number] or via email at [email address]. We are here to assist you every step of the way and regain your full trust. We highly value your patronage, and thank you for your continued support. Furthermore, we strive to maintain the highest standards of service and customer satisfaction, and your feedback is invaluable in helping us improve our processes. Thank you for your understanding, and we look forward to serving you better in the future. Warmest regards, [Your Name] [Your Title/Position] [Company Name]