Some one file the return under my name and SSN on December 31st. 2018. IRS sent me a letter to notify me two months ago. I still have not received my refund.
check your refund status at irs website
https://www.irs.gov/
if you find no information ten I would contact the IRS tax advocate if you filed more than 90 days ago
https://www.irs.gov/advocate/local-taxpayer-advocate
otherwise call the IRS 800
If you are curious... https://www.irs.gov/individuals/instructions-for-requesting-copy-of-fraudulent-returns