Display latest comments (global) with replies on a page

Try with array method, using reply post type with its parent.

<?php
$args = array(
   'post_type'           => 'reply',
   'status'              => 'approve',        
   'post_parent'         => $postID,                   
   'posts_per_page'      => 50,                        
   'orderby'             => 'date',                        
   'order'               => 'ASC',                         
   'hierarchical'        => true,
   'ignore_sticky_posts' => true,                          
);

foreach(get_comments($args) as $comment) :?>