You can try adding a redirect on the thank you page...
<?php
if(!defined('OSTCLIENTINC') || !is_object($ticket)) die('Kwaheri rafiki!'); //Say bye to our friend..
//Please customize the message below to fit your organization speak!
$submitted = 'true';
?>
<div>
<?if($errors) {?>
<p align="center" id="errormessage"><?=$errors?></p>
<?}elseif($msg) {?>
<p align="center" id="infomessage"><?=$msg?></p>
<?}elseif($warn) {?>
<p id="warnmessage"><?=$warn?></p>
<?}?>
</div>
<div style="margin 100px 100px 0;">
<?=Format:($ticket->getName())?>,<br>
<p>
Thank you for contacting us.<br>
A support ticket request has been created and a representative will be getting back to you shortly if necessary.</p>
<?if($cfg->autoRespONNewTicket()){ ?>
<p>An email with the ticket number has been sent to <b><?=$ticket->getEmail()?></b>.
You'll need the ticket number along with your email to view status and progress online.
</p>
<p>
If you wish to send additional comments or information regarding same issue, please follow the instructions on the email.
</p>
<?}?>
<p>Support Team </p>
</div>
<?
//clear to avoid re-posting on back button??
if (isset($submitted))
{
unset($_POST);
header('Refresh: 5;url=http://www.yoururl.com/yoursupport');
}
?>
