A complaint letter template is generally written by the customer to the business people or by subordinates to the seniors, and it can be written for personal as well as business reasons. If you create an effective complaint letter, then you must have to add five key elements that are background, problem statement with cause and effect, possible suggested solution, warning if the problem is serious, as well as proper closing of the letter. A warning section is optional, which depends on the situation or a problem. The matter of the fact is, narrow-minded people will often make complaints seem like a personal affront. However, you can lodge a complaint by writing a complaint letter when you come to realize someone has cheated you badly. Importance of Complaint Letter: In business, companies, customers or clients can file a complaint when they receive faulty products or poor service from the other party. A complaint letter always tries to resolve a problem with a business before seeking help from a consumer protection agency or from a court. Moreover, this letter helps individuals to file a complaint professionally to get justice. There are certain organizations and companies that have separate departments to handle customer