Try this
$args['rewrite']=array('slug'=>'/%my_service_cats%/');
register_post_type( 'my_services', $args);
register_taxonomy( 'my_service_cats', 'my_services', $args);
Try this
$args['rewrite']=array('slug'=>'/%my_service_cats%/');
register_post_type( 'my_services', $args);
register_taxonomy( 'my_service_cats', 'my_services', $args);