How To Write A Grievance Letter To A Hospital . It should clearly state the customer’s name, address and policy and claim number and be written in formal business style. We just come to know about your hospital’s policy that gives concession to needy patients. 34+ Complaint Letter Templates Word, Google Docs, Apple Pages Free from www.template.net Don’t tell them your full birth story or spend a lot of time introducing the story. Copies of supporting documents should be. Acknowledge that you are wrong and state the mistake that you did.