public function batchUnsubscribe($batch, $delete_member = false, $send_goodbye = false, $send_notify = false) {
        $payload = array(
            'id' => $this->listId,
            'batch' => $batch,
			'delete_member' => $delete_member,
			'send_goodbye' => $send_goodbye,
			'send_notify' => $send_notify
        );
        $apiCall = 'lists/batch-unsubscribe';
        $data = $this->requestMonkey($apiCall, $payload);
        $data = json_decode($data, true);
        if (isset($data['error']))
            throw new MailchimpAPIException($data);
        else
            return isset($data) ? $data : false;
    }