Dear [Recipient's Name], I hope this letter finds you well. I am writing to address an issue regarding the cancellation of my [service/product] with [Company's Name] that I believe has been done incorrectly. I have been a loyal customer of [Company's Name] for [duration of time] and have always been satisfied with the level of service and support received. On [date], I received an email from [Company's Name] informing me that my recent cancellation request has been processed successfully. However, I would like to bring to your attention that I never submitted a cancellation request for my [service/product]. This cancellation was made in error and I kindly request your assistance in rectifying this matter as soon as possible. To further clarify, I have reviewed my account history and there is no record of my cancellation request being submitted through the official channels provided by [Company's Name]. I believe this cancellation may have resulted from a system error, miscommunication, or potentially an administrative oversight. Considering my long-standing partnership with [Company's Name], I have always had a positive experience with your team and I trust that this issue can be resolved promptly. I kindly ask that you reinstate my [service/product] and ensure that there are no interruptions or adverse effects on my account due to this erroneous cancellation. Attached to this letter, you will find copies of relevant documentation such as past invoices, proof of payment, and any other supporting material that may assist in resolving this matter swiftly. I urge you to investigate this issue thoroughly to identify the cause of this mistake and prevent any recurrence in the future. I kindly request that you respond to this letter within [specific time frame] with details of the resolution or any further information needed from my end. Your immediate attention to this matter will be greatly appreciated. Thank you for your understanding and cooperation. I value the relationship I have built with [Company's Name] and trust that you will do everything possible to rectify this unfortunate situation. I look forward to a swift and fair resolution. Yours sincerely, [Your Name] [Your Contact Information]