contact-form-wp.php

   $post_id = wp_insert_post([
        'post_type'  => 'contact-form',
        'post_title' => $_POST['name']
    ]);

    $data = [
        'email' => sanitize_email($_POST['email']),
        'first' => sanitize_text_field($_POST['name']),
        'last' => sanitize_text_field($_POST['surname']),
        'message' => sanitize_textarea_field()($_POST['message']),
        'terms' => $_POST['terms'],
    ];

    update_field('form_contact', $data, $post_id);