Dear [Customer's Name], We are writing to inform you about the cancellation of your unfilled order [Order Number] for [Product/Service Name]. We sincerely apologize for any inconvenience this may cause and assure you that we deeply value our customers' satisfaction. Due to unforeseen circumstances beyond our control, we regretfully inform you that we are unable to fulfill your order at this time. [Provide brief explanation if necessary, e.g., production issues, supply chain disruptions, or any other valid justification]. We understand that this cancellation may be disappointing, and we apologize for any inconvenience it may cause you. Rest assured, we have already initiated the refund process for the full amount paid. You should expect the refunded funds to be reflected in your account within [timeframe]. If you encounter any issues regarding the refund, please do not hesitate to contact our customer support team, and they will be happy to assist you further. We understand that this type of situation may not meet your expectations, and it is certainly not the level of service we aim to provide. We assure you that we have taken immediate actions to rectify this situation and prevent such occurrences in the future. Furthermore, we deeply value your business and the trust you have placed in us, and we are committed to making it right. Once again, we apologize for any inconvenience caused, and we sincerely hope that you will consider giving us another opportunity to serve you in the future. We assure you that we will strive to exceed your expectations. Thank you for your understanding. Sincerely, [Your Name] [Your Position] [Company Name]