woocommerce offtopic – Cover a delivery methodology if cart complete is greater than an quantity

In Woocommerce, I’m attempting to take away the ‘flat price’ delivery methodology when the cart complete is greater than 500, utilizing the woocommerce_package_rates. However it isn’t working, when I attempt to debug it by logging errors within the console, I do not see something print there both.

add_filter( 'woocommerce_package_rates', 'custom_package_rates', 10, 2 );
operate custom_package_rates( $charges, $package deal ) {
    $complete = WC()->cart->cart_contents_total;
    echo $complete;
    if( $complete > 500 ) {
        unset( $charges['flat_rate:2'] );
    }
    // debug
    $log_msgs[]=json_encode($charges);
    foreach($log_msgs as $msg) {
        echo "<script>console.log($msg);</script>";
    }
    // return
    return $charges;
}