pewc_disable_pricing.php

<?php
remove_action( 'woocommerce_before_calculate_totals', 'pewc_wc_calculate_total', 10, 1 );
remove_filter( 'woocommerce_cart_item_price', 'pewc_minicart_item_price', 10, 3 );
remove_action( 'woocommerce_cart_calculate_fees', 'pewc_cart_calculate_fees', 10 );

function prefix_remove_actions() {
	remove_action( 'woocommerce_before_calculate_totals', 'pewc_wc_calculate_total', 10, 1 );
	remove_filter( 'woocommerce_cart_item_price', 'pewc_minicart_item_price', 10, 3 );
	remove_action( 'woocommerce_cart_calculate_fees', 'pewc_cart_calculate_fees', 10 );
}
add_action( 'init', 'prefix_remove_actions' );