File a complaint against a business with BBB, search for a business to file a complaint against, or find out the status of a complaint you submitted. File an Online Complaint.Consumer Complaint Form. Select a form from the list below. Select a category to limit the listing to a specific form type. Use the USPS website's Email Us form. Select an inquiry type that most closely relates to the complaint or question that you have. ALL complaints must be submitted in writing. In the Clerk Craft, in any former Contract Postal. Do not purchase or reproduce fake COVID19 proof of vaccination cards, and do not fillin blank vaccination cards with false information.