I have a issue with a new user, his email existed before with other consultant, 

So, when I add him to projects, the user that shows in the portal is the old user, the new user doesn´t show up.  

I deleted the old user and add the new user, (email is the same), show me up the old user than I was deleted, and never show me the new one.

How can I do to delete the old user and add the new one,

Can you help me please?