How To Write A Letter To Director Of Company . In a congratulations letter to director, it is a letter which is written to the director of an organisation and thus it is a business congratulation letter. Your greeting should then list the directors' names in the same order as the address block: Image result Complaint letter, Letter format, Formal letter from www.pinterest.com Click on edit and enter your text as you like. When writing a letter of complaint, your best chance of success will come from directing the letter to the customer service department of the company. Sometimes, you run across an employee who goes above and beyond anything you could ever imagine with his career.