How to disable quantity discounts for wholesale users?

Guys does anyone know how to do this?i'm using dual pricing module and quantity discount module.... the problem is that quantity discount is also calculated for wholesale users even though they have fixed and lowered price....please help me.... what needs to be modified and how?

i added this code in ot_quantity_discount.php right beneath exclude product contitional and it's not working again:

if ($_SESSION['customer_id']) {
$customers_id = $_SESSION['customer_id'];
$customer_check = $db->Execute("select * from " . TABLE_CUSTOMERS . " where customers_id = '$customers_id'");
if ($customer_check->fields['customers_whole'] != "0") {
$disc_amount = 0;
continue;
}
}

what did I do wrong?

is there anybody who can help me?

Do I need to create a case statement in order for this to work?

guys i'm sorry..i did not describe my problem correctly.... the code above works fine.... but i did not use it on quantity discount module.... i was trying to use it for quantity discount in product price manager....