How To Write A Complaint Letter To A Doctor's Office . Thank you for you quick attention to this matter. The first step is to assess who you should complain to. 🎉 Sample complaint letter against doctor. Writing a Strong Complaint from snipe.fm Include any pertinent details in your letter, such as the doctor's name and the specifics of your complaint. That indicates a scheduling problem, not a helpful and empathetic practitioner. Sample complaint letter to hospital for poor service #2.