Just a disclaimer - I may well be miles off track with this comment.

Your URL is hideously long, which suggests it is carrying state information. What does this mean? Well, odds are that the URL is keeping a key to an entry in Telecom's website database.. that entry is created when you log into the website.

The beauty of WWW::Mechanize is that it allows you to simulate a browser session, the WWW::Mechanize module keeping track of state information from page to page.

Thus I would suggest that you go to a simpler site (www.telecom.co.nz) and follow the link to the login page, and then submit the information.

The other thing to do is dump error information after $mechanize->click() e.g.

if ( ! $mech->success() ) {
    print( STDERR $mech->status() . "\n" );
}
else
{    
    print( STDERR "-At->" . $mech->uri() . "\n" );
}
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