// Hack Contact Form 7 to avoid unwanted ajax calls
add_action('wpcf7_enqueue_scripts', 'hack_cf7');
function hack_cf7() {
    $_wpcf7 = array(
        'loaderUrl' => wpcf7_ajax_loader(),
        'sending' => __( 'Sending ...', 'contact-form-7' )
    );
    wp_localize_script( 'contact-form-7', '_wpcf7', $_wpcf7 );
}