Mail sent / not sent messsage not shown

Form on page looks exactly as:

<div class="form-widget">
<div class="form-result"></div>

        <form class="row" id="zithr" action="include/form.php" method="post">

            <div class="form-process"></div>

            <div class="col-md-6 form-group">
                <label for="zithr-name">ФИО <small>*</small></label>
                <input type="text" id="zithr-name" name="zithr-name" value=""
                       class="form-control required"/>
            </div>

            <div class="col-md-6 form-group">
                <label for="zithr-email">Электронная почта <small>*</small></label>
                <input type="email" id="zithr-email" name="zithr-email" value=""
                       class="required email form-control"/>
            </div>

            <div class="w-100"></div>

            <div class="col-12 form-group">
                <label for="zithr-message">Сообщение <small>*</small></label>
                <textarea class="required form-control" id="zithr-message"
                          name="zithr-message" rows="6" cols="30"></textarea>
            </div>

            <div class="col-12 hidden">
                <input type="text" id="zithr-botcheck" name="zithr-botcheck" value=""
                       class="form-control"/>
            </div>

            <div class="col-12">
                <button class="button button-rounded button-large ls0 t400 m-0 nott" type="submit" id="zithr-submit"
                        name="zithr-submit" value="submit">Переслать
                </button>
            </div>

            <!-- Form Settings -->

            <!-- Поля прямого письма - с сайта в адрес Анны Зайцевой -->
            <input type="hidden" name="prefix" value="zithr-">
            <input type="hidden" name="subject" value="Сообщение с сайта курса для HR по IT-рекрутингу">
            <input type="hidden" name="replyto" value="zithr-email">
            <input type="hidden" name="html_title" value="Получено сообщение с сайта...">

            <!-- Поля автоответа сервера на адрес посетителя сайта, указанный в форме обратной связи -->
            <input type="hidden" name="autoresponder" value="false">

        </form>
    </div>

include/form.php important parts of code are:

/-------------------------------------------------
Sender's Email
---------------------------------------------------/

$fromemail = array(
'email' => 'info@bulash.ru', // Company's Email Address (preferably currently used Domain Name)
// 'email' => 'anna.recruting@gmail.com', // Company's Email Address (preferably currently used Domain Name)
'name' => 'Сайт курса для HR по IT-рекрутингу' // Company Name
);

/-------------------------------------------------
PHPMailer Initialization
---------------------------------------------------/

$mail = new PHPMailer();

/* Add your SMTP Codes after this Line */

$Google = false;
$Yandex = true;
// If both are false - error message shown
// If one of them assigned to true - not shown success / error

if ($Google) {
$mail->isSMTP();
$mail->SMTPDebug = 2;
$mail->CharSet = 'UTF-8';

$mail->Host = "smtp.gmail.com";
$mail->Port = 465;
$mail->SMTPSecure = 'tls';
$mail->SMTPAuth = true;
$mail->Username = "anna.recruting@gmail.com";
$mail->Password = "***";

}
if ($Yandex) {
$mail->isSMTP();
$mail->SMTPDebug = 2;
$mail->CharSet = 'UTF-8';

$mail->Host = 'smtp.yandex.com';
$mail->Port = 587;
$mail->SMTPSecure = 'tls';
$mail->SMTPAuth = true;
$mail->Username = "info@bulash.ru";
$mail->Password = "***";

}

// End of SMTP

What's happened:

• Both $Google and $Yandex set to false - shown red alert - can't instantiate PHPMailer. Sure.

• $Google == true. Mail message sent finished with error (I see it by debug) but no error message shown. Spinner rotating indefinitely, form blocked. Why?

• $Yandex == true. Mail message sent finished with no error (message received) but no success message shown. Spinner rotating indefinitely, form blocked. Why?