They did the same shit to me. I refused and pestered them with numerous e-mails demanding them to just delete my account instead of reopening it. Finding a link to their contact form was a nightmare (it's hidden all the way at the bottom of their privacy policy). I also emailed legal@linkedin.com, dpo@linkedin.com, helpdesk@linkedin.com, support@linkedin.com and a number of other generic addresses just to be sure they would receive something.
I got three LLM sounding replies where they asked me to follow a link to verify my identity with a government issued identity document, but after a couple more e-mails where I wrote that providing Persona or LinkedIn with my identity documents is against my personal security policy, they just caved and reopened my account calling it a "temporary measure to protect my account". Set a new password, logged in and deleted my account immediately. Good riddance.