I emailed them a long time ago to tell them to delete my data. They asked for more data, which I declined. I'm curious what their legal requirements would be in

I emailed them a long time ago to tell them to delete my data. They asked for more data, which I declined. I'm curious what their legal requirements would be in that case. I'd hope that since they could easily figure out who I am and delete my data from just my email, that it would mean they're still required to do so without me giving even more data, but who knows.