How to redirect after form submission in contact form 7?

I am using contact form 7 to submit a form and generate a reference number through soap client using the wpcf7_before_send_mail.

The code is

function wpcf7_do_something($WPCF7_ContactForm)
{

    if (3490 == $WPCF7_ContactForm->id()) {
      $client = new SoapClient('http://xxx.xxx.xxx.xxx:xxxxx/4dwsdl', array('trace' => 1));
   $res_date = date("Y-m-d", strtotime('01 feb 2015'));
   $enquiry_id = $client->__call('WS_AddContact',  
       array(
           'narwal Devender',
           null,
           'Devender',
           'narwal',
           'hisar',
           'Hisar',
           'Haryana',
           '125001',
           'Australia',
           '01662246138',
           '9802260750',
           '8529000369',
           'vijaylal@webmastershisar.com',
           true,
           'google',
           'google',
           'Phone Call',
           0,
           'type of good should be strode.',
           $res_date,
           '2 to 6  Months',
           'SSPSS',
           null,//array('xxxxxxx'),
           array('46.75'),
           array('1 x 1 x 1 (1qm)'),
           array('xxxxxxxxx'),
           array('send print should be here to work.'),
           null,
           'xxxxxxxxxxxxx',
           null
       )
   );


   mail('vijaylal@webmastershisar.com', 'My Subject', $enquiry_id); 

  }
  return $wpcf7;
}

This is working fine and sending email.

But I want to show the enquiry id to the custom on thankyou page or any page or by using some redirect and sending data to the url.

I am also trying to use this code in wpcf7_mail_sent this also work,

But when I am trying to use redirect It does nothing and contact form hangs simply.

add_action('wpcf7_mail_sent', 'wpcf7_redirect_on_submit');

function wpcf7_redirect_on_submit($wpcf7)
{
        header( 'Location: http://www.google.com' );
        exit;
}

How can I redirect contact form in wpcf7_mail_sent without using javascript or jQuery on_sent_ok?

or

How can I show this Enquiry id to the user on a page?

Can anybody please help to get this work done.