Fellow Canadians tax question!

So, I’ve been getting emails from the CRA about a “statement of account”. I collected the CESB when covid FIRST hit in 2019/20 (?) this one was the student benefit. I was in college when I collected, why are they trying to get the money back now? They’re after 4500$. Which is funny because last year my tax return for 2022 was 4700$.

I’m scared to file this year, I’m pregnant with baby #3 & I will be going on mat leave in April & I will NEED my child tax benefit & I’m scared to lose it! Will I lose my child tax benefit due to the “statement of account”? Should I call CRA & ask why they want 4500$ back when I was a student. My child was 1 years old & he was in a headstart program as well, which they closed due to covid but he was registered!