The Wix Forum is a Wix app and not a code related issue, of which this Wix Corvid Forum is for.
https://support.wix.com/en/article/blocking-or-deleting-site-members-in-the-wix-forum
You would be much better suited going through wix Support themselves.
https://support.wix.com/en/article/contacting-wix-support
https://support.wix.com/en/article/contacting-wix-by-phone-3491545