How To Write A Letter To Discontinue Service Template . A termination letter is mostly written to inform the client that a particular service/service you are providing for them is being stopped and wouldn’t continue for a certain reason. There may be provisions about cancelling including a specific period of time or condition. Service Cancellation Letter Sample business form letter template from www.businessformlettertemplate.com Find your letter to discontinue service template, contract, form or document. Tell the company or vendor why you would like to stop subscribing to the service or would like it turned off. According to the contract signed on [date], cancellation is allowed if your service is not performed regularly each week.