public function deleteSubscription( $email, $contentObjectID, $languageID )
    {
        $subscriber = ezcomSubscriber::fetchByEmail( $email );
        $cond = array();
        $cond['subscriber_id'] = $subscriber->attribute( 'id' );
        $cond['content_id'] = $contentObjectID;
        $cond['language_id'] = $languageID;
        $cond['subscription_type'] = 'ezcomcomment';
        $subscription = ezcomSubscription::fetchByCond( $cond );
        $subscription->remove();
    }