Ex language school keeps asking for my details

I successfully graduated from language school last year, obtained a work visa, and have been minding my business as a regular sad salaryman.

My old language school keeps emailing me for my visa details, my current company's info, etc. Today they even threatened me that if whatever they report to the immigration bureau doesn't match my actual visa details, my residence status will be affected. To me that sounds like absolute nonsense, and I'm not keen on sharing my private details with a school I'm not longer affiliated with.

Could someone confirm, before I start overthinking this?

by synthixa