When I click submit button my form data is storing two times in my db please help as I am fresher unable to solve this issue

<?php /*Template name: gold loan enquiry */


get_header(); ?>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
    $(document).ready(function() {

  $("#source").change(function() {

    var el = $(this).children("option:selected").val();
    
    if(el == "loan" ) {
    $("#status").show();
    } else {
    $("#status").hide();
    }
  });
  document.getElementById('box').onchange = function(){
    if(this.checked) alert("You receive calls");
    else alert("You dont receive any calls");
};

});

    </script>
    <style>
        .loans img{ display: none; }
    </style>
 <!-- breadcumb-area start -->
 <?php $backgroundImg = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full' );?>
        <div class="breadcumb-area black-opacity bg-img-3" style="background-image: url('<?php echo $backgroundImg[0]; ?>'); background-position: initial;">
            <div class="container">
                <div class="row">
                    <div class="col-xs-12">
                        <div class="breadcumb-wrap">
                            <h2><?php the_title(); ?></h2>
                        </div>
                    </div>
                </div>
            </div>
            <div class="breadcumb-menu">
                <div class="container">
                    <div class="row">
                        <div class="col-xs-12">
                            <ul>
                                <li><a href="<?php echo site_url(); ?>">Home </a></li>
                                 <li>/</li>
                                <li><?php the_title(); ?></li>
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <!-- breadcumb-area end -->
<section class="inner-area">
            <div class="container">
                <div class="row">

         <div class="col-md-12">
                  <div class="section-title text-center wow fadeInUp">
                            <h2><?php the_title(); ?></h2>
                                                    </div>
                <div class="col-md-7 remove-thum-img"><?php the_post_thumbnail($post_id, array( 50, 50) ); ?> </div>

        <?php
        // Start the loop.
        while ( have_posts() ) : the_post();

            // Include the page content template.
            get_template_part( 'template-parts/content', 'page' );

            // If comments are open or we have at least one comment, load up the comment template.
            if ( comments_open() || get_comments_number() ) {
                comments_template();
            }

            // End of the loop.
        endwhile;
        ?>
        <br>
        <div class="row">
     
                                                    
        <div class="col-md-7 col-xs-12 fadeInRight wow">
          <p style="text-align: left;">Enquire Now:</p>
                        <div class="faq-form thumbnail well" style="padding: 20px 20px 3px 0;">
                            <div class="cf-msg"></div>
                            <form class="form-horizontal" id="cf" action="">
                  <div class="form-group">
                     <label class="control-label col-sm-6">Name:</label>
                     <div class="col-sm-6">
                        <input type="text" class="form-control" name="namess" required>
                     </div>
                  </div>

                  <div class="form-group">
                     <label for="phoneno" class="control-label col-sm-6">Mobile Number:</label>
                     <div class="col-sm-6">
                       <input type="tel" class="form-control" name="phone" id="phoneno" pattern="[0-9]*" maxlength="10" required>
                     </div>
                  </div>
                  <div class="form-group">
                     <label for="acn" class="control-label col-sm-6">Customer with branch & A/c No:</label>
                     <div class="col-sm-6">
                       <input type="text" class="form-control" name="account" required>
                     </div>
                  </div>
                  <div class="form-group">
                     <label for="feedback" class="control-label col-sm-6">Feedback/Grievance details</label>
                     <div class="col-sm-6">
                       <textarea class="form-control" name="feedback" required></textarea>
                     </div>
                  </div>
                  <div class="form-group">
                     <div class="col-sm-offset-6 col-sm-6">
                        <button type="submit" name="submit" value="submit" class="btn btn-primary">Submit</button>
                     </div>
                  </div>
               </form>
	
                        </div>
                    </div>

					<?php  
    global $wpdb;
	 if(isset($_REQUEST["submit"])){
	$namess=$_REQUEST["namess"];
    $phone=$_REQUEST["phone"];
	$account=$_REQUEST["account"];
    $feedback=$_REQUEST["feedback"];
	
		$to='kuldeep.kaluvala@gmail.com'; // Receiver Email ID, Replace with your email ID
		$subject='Form Submission';
		$message="Name :".$name."\n"."Phone :".$phone."\n"."Wrote the following :"."\n\n".$msg;
		$headers="From: ".$email;

		if(mail($to, $subject, $message, $headers)){
			echo "<h1>Sent Successfully! We will contact you shortly!</h1>";
		}
		else{
			echo "Something went wrong!";
		}
	
	
	$sql="insert into grievance_enquiry (namess,phone,account,feedback)values('".$namess."','".$phone."','".$account."','".$feedback."')";
	 
	$status = $wpdb->query($sql);
   
	
	if($status>0){
			echo "<script type='text/javascript'>alert('submitted successfully!')</script>";
		}
			
}

?>
                  </div>
               
        </div>
         </div>

            </div>
        </section>
<?php get_footer(); ?>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.5.0/css/bootstrap-datepicker3.min.css">
    <script type='text/javascript' src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.5.0/js/bootstrap-datepicker.min.js"></script>
<script type='text/javascript'>
$(function(){
$('.input-group.date').datepicker({
  format: 'yyyy-mm-dd',
     minViewMode: 0,
    calendarWeeks: true,
    todayHighlight: true,
    autoclose: true
});  
});

</script>