Unwanted subrscitions

Hi
In my site sovio-sovelius.com I am useing Memebrship 2 to let Familymembers look at some hidden pages.
My intention is to get membership ONLY by sending an e-mail through links on the site to an administrator, who register the user and sends back UserID and passwd.
All other tries to become a member I have tied to avoid.
Still I get e/mails from members who has succeeded to register an userID and waiting for approval, like tis:

” New user requires approval on your blog :

Username: jeanniefrancis
E-mail: jeanniefrancis40@eu.360ezzz.com

To approve or deny this user:
http://sovio-sovelius.com/2016/wp-admin/users.php?role=pending ”

Where have I done wrong?
Can anyone help me?
Priccen