Page is getting Submit Without Refresh Via Otp?

I got this website when I fill the information and try to send the OTP page reload Here's the website:

https://tunisia.blsspainvisa.com/english/book_appointment.php

After you fill the information and click on (Request verification code) and you will know what I mean

What I tried is:

$(function () {

  $('#tunisiaThird').on('submit', function (e) {

    e.preventDefault();

    $.ajax({
            type: 'post',

        url: 'https://tunisia.blsspainvisa.com/book_appointment.php',

        data: $('#tunisiaThird').serialize(),



            success: function () {
      }
    });

  });
});

I'm only a client, so I'm using Tampermonkey to inject.