Am I a victim of identity theft.

Yesterday I received a letter in the mail from the IRS with a letter number 5071C, my correct last 4 SSN digits, and letting me know that my tax return for 2022 was filed. This is despite me not having a job/income (Im a college student), and my parents saying they never filed anything on my behalf. Does this mean someone else has my SSN? In a panic I froze my credit with every bureau ,the big 3 + others, and request and IRS pin, and told them I didn't file it. Is there anything else I can do at this moment? Is there anything else I need to do to ensure my safety? As far as I can tell, the filer failed to do what they set out to do as the IRS identified it and contacted me.