If a product or service has left you dissatisfied, a well-crafted, effective letter of complaint can help ensure that the issue is taken care of quickly and correctly. Writing a strong letter of complaint is a critical step to take when seeking resolution–follow this guide on how to write an effective and professional letter of complaint.   Follow the Proper Format for Complaint Letters. A formal complaint letter should include the following essential components: an introduction, a brief overview of the issue, evidence that supports your complaint, a clear statement of what you would like to see as a resolution, and contact information.   Please double-check that your letter is…