How is alexa getting past my stoppers

stop alexa index

[Michel Samuel]

I just have checké my stats and alexa is still getting access to my site. (not just hit on robots.txt)

my robots.txt has these lines to make certains.
______
User-agent: ia_archiver
Disallow: /

User-agent: ia_archiver/1.6
Disallow: /

User-agent: Alexibot
Disallow: /
_____

I have also maked the .htaccess file stop all referals from alexa.

----------
RewriteCond %{HTTP_REFERER} alexa\.com [NC,OR]
RewriteCond %{HTTP_REFERER} archive\.org[NC]
RewriteRule .* - [G]
----------

It eats much bandwidth!
And I do not want my traffic logged by them.
(It is like having a person sit outside your home and counting the people that enter... of my opinion it is ilegal)

Is there plus I can do to make this bot disappear?