Dear [Recipient's Name], I am writing to express my dissatisfaction with the recent cancellation of [Service/Product/Subscription] associated with my [Account/Policy/Order] number [XXX]. I believe that there has been a mistake in the cancellation process, and I kindly request you to rectify the situation promptly. Upon receiving the cancellation notification, I was surprised and taken aback, as I have been a loyal customer for [number of years/months]. I have always been satisfied with the quality and performance of the [Service/Product] provided by your esteemed company. However, it seems that there might have been an administrative error or misunderstanding leading to this cancellation. I kindly request you to thoroughly review my account and provide me with a detailed explanation regarding this cancellation. Please consider the following points: 1. Clarify the reason for canceling my [Service/Product/Subscription]. If it was due to non-payment, I assure you that I have been consistently making my payments on time and can provide evidence if required. 2. If the reason for cancellation was due to a service/product change, I was not informed proactively. I request you to provide the specific details of why this change was made without my knowledge. 3. Verify if there has been any mistake in identifying my account. It is possible that my account might have been confused with another customer's, leading to the incorrect cancellation. I firmly believe that this cancellation was made in error, and I kindly request you to reinstate my [Service/Product/Subscription] as soon as possible. I consider this matter to be of utmost urgency, as it has caused inconvenience and disruption to my daily routine. To expedite the resolution of this issue, I have attached relevant documents such as payment receipts, account statements, or any other supporting materials that might assist you in investigating the matter thoroughly. Should you require any further information, I am more than willing to provide it promptly to rectify this situation. I trust that the matter will be given due attention, and I am confident that a satisfactory resolution will be reached. I anticipate your prompt and positive response to this matter. Thank you for your immediate attention in this regard. Sincerely, [Your Name] [Your Contact Information]