showing parent category in woocommerce custom pages

<?php 
				    $taxonomyName = "product_cat";
//This gets top layer terms only.  This is done by setting parent to 0.  
    $parent_terms = get_terms($taxonomyName, array('parent' => 0, 'orderby' => 'slug', 'hide_empty' => false));

    echo '<ul>';
    foreach ($parent_terms as $pterm) {

        //show parent categories
        echo '<li><a href="' . get_term_link($pterm->name, $taxonomyName) . '">' . $pterm->name . '</a></li>';

        $thumbnail_id = get_woocommerce_term_meta($pterm->term_id, 'thumbnail_id', true);
        // get the image URL for parent category
        $image = wp_get_attachment_url($thumbnail_id);
        // print the IMG HTML for parent category
        echo "<img src='{$image}' alt='' width='400' height='400' />";

       
        }
    
    echo '</ul>';
			 ?>