This is the code for displaying WooCommerce Product Categories

woocommerce-product-categories

function woocommerce_product_category( $args = array() ) {
    $woocommerce_category_id = get_queried_object_id();
  $args = array(
    	'parent' => $woocommerce_category_id
  );
  $terms = get_terms( 'product_cat', $args );
  if ( $terms ) {
    	echo '<ul class="woocommerce-categories">';
    	foreach ( $terms as $term ) {
        	echo '<li class="woocommerce-product-category-page">';
            woocommerce_subcategory_thumbnail( $term );
        	echo '<h2>';
        	echo '<a href="' .  esc_url( get_term_link( $term ) ) . '" class="' . $term->slug . '">';
        	echo $term->name;
        	echo '</a>';
        	echo '</h2>';
        	echo '</li>';
    	}
    	echo '</ul>';
  }
}
add_action( 'woocommerce_before_shop_loop', 'woocommerce_product_category', 100 );