User didn't delete from authentication

I just removed the user (OAuth using Google provider) manually from the auth tab, and when I tried to log in again from my web I got the error in the first picture, so I tried to add it manually from auth tab but got the an error "the user already exist" this is not the first time im facing this error when I deleted a user manually from auth tab, in the previous time I just opened a new project, but now this is not optional solution. if this is supposed to be like this, just give an option to fully delete users or let me know how to delete user correctly.