new site wp-admin takes me to old site wp-admin

I updated the wp config file sitename but i still cant login to the cloned site because mysite.com/wp-admin takes me to the old sites admin login page.

both sites are on the same host and the new site is in a subdirectory of the old

Please guide me how to fix this, thanks

https://wordpress.org/plugins/wp-clone-by-wp-academy/