A friend had someone sign up for Instagram using her Gmail address by mistake. There's no way to unsubscribe and no way to contact Insta without logging in (and

A friend had someone sign up for Instagram using her Gmail address by mistake. There's no way to unsubscribe and no way to contact Insta without logging in (and it was in another language). In the end she changed the password and took over the account; it was the only reasonable option.