You need to report this possibility to SSA and the IRS as soon as possible to protect yourself.
Here, first is some information from the IRS:
Are you a victim of identity theft?If you receive a notice from the IRS, please call the number on that notice.
If not, contact the IRS at800-908-4490
Fill out the IRS Identity Theft Affidavit, Form 14039
(Please write legibly and follow the directions on the back of the form that relate to your specific circumstances.)
Visit the Federal Trade Commission or call the FTC toll-free identity theft helpline:1-877-ID-THEFT(1-877-438-4338)
Visit the Internet Crime Complaint Center (IC3) to learn more about their internet crime prevention tips
Report suspicious online or emailed phishing scams to:firstname.lastname@example.org
For phishing scams by phone, fax or mail, call:1-800-366-4484
We know identity theft is a frustrating process for victims. We take this issue very seriously and continue to expand on our robust screening process in order to stop fraudulent returns.
Identity theft occurs when someone uses your personal information such as your name, Social Security number (SSN) or other identifying information, without your permission, to commit fraud or other crimes.
Usually, an identity thief uses a legitimate taxpayer's identity to fraudulently file a tax return and claim a refund. Generally, the identity thief will use a stolen SSN to file a forged tax return and attempt to get a fraudulent refund early in the filing season.
You may be unaware that this has happened until you file your return later in the filing season and discover that two returns have been filed using the same SSN.
Be alert to possible identity theft if you receive an IRS notice or letter that states that:
If you receive a notice from IRS, respond immediately. If you believe someone may have used your SSN fraudulently, please notify IRS immediately by responding to the name and number printed on the notice or letter. You will need to fill out the IRS Identity Theft Affidavit, Form 14039.
For victims of identity theft who have previously been in contact with the IRS and have not achieved a resolution, please contact the IRS Identity Protection Specialized Unit, toll-free, at 1-800-908-4490.
If your tax records are not currently affected by identity theft, but you believe you may be at risk due to a lost/stolen purse or wallet, questionable credit card activity or credit report, etc., contact the IRS Identity Protection Specialized Unit at 1-800-908-4490.
Next, Social Security:
You should attend to this as quickly as possible. Thieves realize their time to act is short and do their work quickly.