The letter Clear and concise writing. It's helpful to explain the problem and say how you want the company to resolve it. Dear Mr/Mrs/Ms [name of the firm’s contact] am writing to make a formal complaint against [name of individual who provided the service]. describe what the service provider had been hired to do for you [for example dealing with the sale or purchase of a house] Are you looking to write an effective complaint letter? Make the letter clear and include only Complaint Letter: Wha