Asked to submit self-assessment when already Stopped

I work for a private company, not self-employed or anything like that. When my child was young, I claimed child benefit. My wages rose over £50,000pa, so I stopped claiming. I filled in a self-assessment form for that final year, which resulted in paying back a little bit. All good. I then requested to be removed from self-assessment because just back to standard employment now, with no child-benefit any more. That Stop seemed to go through: I got a comms message in my HMRC app that says successful, and that I don't need to send a tax return any more... "unless HMRC tell me to". But HMRC still email me every year saying that I DO need to submit one, or tell them that I don't need to. I seem to be stuck in the self-assessment process. Seeing as I AM already Stopped, do I just ignore that email ever year? Sounds dangerous. But I'm loathe to keep filling in the "I don't need to submit one" form AGAIN every year for the rest of my life.

Hi,
Unfortunately as we would need to access your record to answer your query, you will need to contact our Self Assessment team for advice.
Self Assessment: general enquiries
Thank you.