Deregister Select2

/**
* Removes enhanced select boxes from WooCommerce Checkout.
* Add to theme functions.php file
*/

add_action( 'wp_enqueue_scripts', 'agentwp_dequeue_stylesandscripts', 100 );

function agentwp_dequeue_stylesandscripts() {
    if ( class_exists( 'woocommerce' ) ) {
        wp_dequeue_style( 'select2' );
        wp_deregister_style( 'select2' );
        wp_dequeue_script( 'select2');
        wp_deregister_script('select2');
    }
}