php - CSRF Protections with AJAX & FORM - CodeIgniter - Not Sending

In the beginning I turned off my CSRF just for simplicity reasons to make my form / ajax work. Now when I turned it on and tried to use the inputs and stuff for CSRF nothing will work. My form doesn't submit or when It does my whole page refreshes which I can't let that happen. Here is my current code.

form method="post">
  <input type="text" name="vip_text_box" id="vip" value="<?php echo $total_amount ?>"> <br><br>
  <input type="submit" id="submit" value="Redeem" onclick="return rebate_amount()">
  <input type="hidden" name="<?php echo $this->security->get_csrf_token_name(); ?>" value="<?php echo $this->security->get_csrf_hash(); ?>">
</form>
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And the AJAX:

function rebate_amount(){

  var value = document.getElementById('vip').value;
  var datastring = 'vip='+value;
  var url = base_url + '/index.php/home/redeeming_form_value';

  $.ajax({
    type : 'post',
    url : url,
    data: datastring,
    cache: false,
    success: function(html){

      $('#vip_point_redeeming').html(html);

    }
  });
  return false;
}
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Keep in mind. This all works when CSRF is off in the config file. But I think theres a problem here with CSRF with form / ajax.