File an Online Complaint. File a complaint online, apply manually or in-person, download manual complaint form.If you're dealing with a lost package or mailpiece, USPS can help with a Missing Mail Search. Learn how to find lost mail, file claims, and request refunds. Our Investigation starts with your report. You complete a Certificate of Service or Proof of Service form that describes how and when you served the papers. Use our online form to answer a few questions about your issue. Please provide as much detail as you can. Go to USPS website, scroll down to contact, click on 'Email' and then scroll down to 'Personnel' and make the complaint. I just need to figure out what I should do to get my civil right.