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. The declaration option does not require notarization; you need only fill in the blanks with the date and your location (city, state), and sign the declaration.After downloading and printing applicable forms, please fill out and mail to: Suffolk County Police Department Headquarters 30 Yaphank Ave Yaphank, NY 11980. This form allows consumers to file complaints against businesses regarding poor service, unsatisfactory products, or unethical business practices. Customer Complaints. 3 Customer Complaints.