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<?php
    $children = wp_list_pages('title_li=&child_of=1562&sort_column=menu_order&echo=0');
    
    $children = preg_replace('@\<li([^>]*)>\<a([^>]*)>(.*?)\<\/a>@i', '<a$1$2>$3</a>', $children);
    $children = str_replace('page_item', 'list-group-item list-group-item-action', $children);
    $children = str_replace('current_list-group-item', 'active', $children);

    if($children){
        echo $children;
    }
?>