Wordpress - Multiple orderby values in WP_Query

@Musa how can we put multiple order value for the fields? I was wondering the same question and I found this :

In 4.0, you can now pass an array to WP_Query as the value for orderby.

The syntax looks like:

$q = new WP_Query( array( 
    'orderby' => array( 
       'title'      => 'DESC', 
       'menu_order' => 'ASC' 
    ) 
));

Have a look here for more details : https://make.wordpress.org/core/2014/08/29/a-more-powerful-order-by-in-wordpress-4-0/

$query=new WP_Query(array(
                'post_type'=>'wpcontactus',
                'nopaging'=>true,
                'post_status'=>array('publish', 'pending', 'future'),
                'meta_query'=>array(
                                array('key'=>'wcu_dept','value'=>$dept_id, 'compare'=>'='),
                            ),
                'meta_key'=>'wcu_firstname',
                'orderby'=>'menu_order wcu_firstname',
                'order'=>'ASC'
        ));

By using what @kaiser suggested and the meta_query option, I was able to get the query I was looking for.