If you have a terrible experience with a company and you want to make sure that your grievances are heard, one of the best ways to do this is to file a complaint. Filing a complaint helps other people to see that you were unhappy with the behavior of a particular company, and can also prompt that company to change its ways in order to maintain a better reputation. However, for many people, it can be difficult to understand how to complain about a business in a way that really has an impact.