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Contact the Social Security Administration (SSA). File a report with the Federal Trade Commission (FTC). File a police report with your local police. File a complaint with the Internet Crime Complaint Center (IC3).
This is arguably the most important step in the entire process. In order to request a new card, you have to file a report with the SSA. You can contact them at www.ssa.gov or call toll-free at 1-800-772-1213 (TTY 1-800-325-0778). They can replace your missing social security card with your original number or a new number.  If you suspect someone is using your number, you should contact the SSA to report the issue. The SSA will review your earnings with you to ensure its records are correct. You can also review earnings posted to your account on your Social Security statement. This statement is available online, and you can get it at www.ssa.gov/myaccount after creating an account. Note that, if someone used your social security number to get a line of credit, the SSA cannot resolve these problems. The FTC collects information that can lead to an investigation or prosecution of identity thieves, but does not resolve individual cases relating to a stolen Social Security card.  Online: Complete the FTC's online complaint form. You can find the form at www.ftc.gov/complaint. Complete the complaint form with as many details as you know. Save the reference number and submit your information. You need that reference number to update your complaint online or by phone. When you finish writing all the details, print a copy of the report. It will print as an Identity Theft Affidavit. Make sure to save or print your Affidavit. You can use this document to file for a police report or to counter false credit charges made in your name. By Phone: Call the FTC at 1-877-438-4338 or 1-866-653-4261 (TTY). Explain the issue to the representative and ask for your complaint reference number and affidavit password. The FTC representative will email you a link, so you can print or save your Affidavit  Keep record dates and copies of your Affidavit in your files and if necessary, call the FTC to update your complaint. You will need to provide your complaint reference number. Bring with you a copy of your FTC Identity Theft Affidavit, any other proof of the theft, a government issued ID with a photo, and proof of your address (rental agreement, pay stub, or utilities bill). Complete a report on the theft and ask for a copy of the report. The Internet Crime Complaint Center is run by the Federal Bureau of Investigation and the National White Collar Crime Center. It functions as a way to register complaints regarding fraudulent online accounts. Obviously, only file a complaint with them if you suspect that someone has stolen your social security number online.