Phpmailer sending email as plain text to emails

O am for the first time facing an issue with phpmailer, does anyone has any idea why phpmailer is sending email as follow? it somehow not tonverting the email into html contecn i just cannot seem to figure out why this is happening

no=reply@domain.com
6:16 PM (0 minutes ago)
to me

--b1_948b9a2ff8436cf0db01abf3e30c0373
Content-Type: text/plain; charset=us-ascii


Request information form was submitted, details are given below.




                        Name
                        Email
                        Mobile
                        State
                        Plans
                        Destination
                        Total Travellers
                        Travel Within
                        Comments


                        debojit
                        no@email.com
                        451-245-7845
                        Georgia
                        Bags packed, I'm ready to go!
                        France
                        9 people
                        6-9 months
                        werwer




Regards,

company name



--b1_948b9a2ff8436cf0db01abf3e30c0373
Content-Type: text/html; charset=us-ascii


<h4>Request information form was submitted, details are given below.</h4>
<br/>
        <table border="1" style="width:100%">
        <tbody>
                <tr>
                        <td><b>Name</b></td>
                        <td><b>Email</b></td>
                        <td><b>Mobile</b></td>
                        <td><b>State</b></td>
                        <td><b>Plans</b></td>
                        <td><b>Destination</b></td>
                        <td><b>Total Travellers</b></td>
                        <td><b>Travel Within</b></td>
                        <td><b>Comments</b></td>
                </tr>
                <tr>
                        <td>debojit</td>
                        <td>no@email.com</td>
                        <td>451-245-7845</td>
                        <td>Georgia</td>
                        <td>Bags packed, I'm ready to go!</td>
                        <td>France</td>
                        <td>9 people</td>
                        <td>6-9 months</td>
                        <td>werwer</td>
                </tr>
        </tbody>
</table>               
<br/><br/>
Regards,
<br/>
company name



--b1_948b9a2ff8436cf0db01abf3e30c0373--

this is how i send mails

$mail = new Mail();
$mail->setFrom(senderemail);
$mail->addAddress(email);
$mail->addReplyTo($email);
$mail->subject($subject);
$mail->body($body);
//$mail->send();      
if($mail->send()){
     echo '<div class="alert alert-success" role="alert">Thanks for contacting us, we\'ll get back to you soon.</div>';
     echo "<meta http-equiv='refresh' content='5;url=contact-us.php'>";

    }else{
     echo '<div class="alert alert-danger" role="alert">Some problem occurred, please <a href="contact-us.php">try again</a>.</div>';
    echo "<meta http-equiv='refresh' content='5;url=contact-us.php'>";
  }
}   

I tried adding $mail->IsHTML(true); etc but nothing seems to be working, what could be possible wrong here guys?

source https://stackoverflow.com/questions/70863737/phpmailer-sending-email-as-plain-text-to-emails