Call the IRS, 800-908-4490 Extension 245 is for Taxpayers Not in Previous Contact with IRS
Create a IRS Online Account https://api.id.me/en/registration/new
Logon to your IRS Account for more information https://www.irs.gov/payments/your-online-account
Get an ID Protection PIN (IP PIN) from the IRS Account
https://www.irs.gov/identity-theft-fraud-scams/get-an-identity-protection-pin
File Form 14039 ID Theft Affidavit https://www.irs.gov/pub/irs-pdf/f14039.pdf
Report ID Theft to Federal Trade Commission https://www.identitytheft.gov
Visit the Internet Crime Complaint Center https://www.ic3.gov/ File an online report
Notify one of the three major credit bureaus: Equifax, Experian, or TransUnion. Check your credit report for anything out of the ordinary. (You can get a free credit report at AnnualCreditReport.com)
IRS Identity Theft Guide https://www.irs.gov/newsroom/taxpayer-guide-to-identity-theft
Social Security Administration Office Identity Theft Guide https://www.ssa.gov/pubs/EN-05-10064.pdf