Whether you need to file a complaint, post a review, tell us about a misleading advertisement, or report a scam, you're in the right place. Here's how to file a complaint with Better Business Bureau.First, contact the business directly. Download. You may also complete the consumer complaint form and deliver via postal mail, email or fax using the contact information below. Need to file a complaint? BBB is here to help. Submit the complaint using their Online Form. By Mail: Download, fill out, and mail this form to either their Phoenix or Tuscan Location. You have two options when filing a complaint. Use our online system or download a complaint form.