URGENT! ACCOUNT HACKED

do you have any backups of your website stored locally (offline) ?
do you have access to your ftp?
if both answers are yes, delete the website from your ftp, reinstall wp, restore it from backup, immediatelly change your password -> problem solved.
i would recommend using 2FA next time

Review this guide: https://www.ads-software.com/documentation/article/faq-my-site-was-hacked/