Contact form on our website is sending us spam

Bit of a blast from the past, this is still an issue while we are talking to the company who did our website.

Can anyone help me remove or just disable the contact form?
 
We don't want it to show on the index page.
I tried that <!-- --> tag last night and it greyed out the text, but when I uploaded it, the form was still showing.

Here's the code, where abouts should I be putting the comment tags?

<script src="https://www.google.com/recaptcha/api.js?onload=myCallBack&render=explicit" async="" defer=""></script>
<script></script>
<script type="text/javascript"></script>
<section id="main-slider" class="no-margin">
<div class="carousel slide">
<div class="carousel-inner">
<div class="item active">
<div class="container">
<div class="slide-margin mac-home">
<div class="">
<div class="col-md-8 animation animated-item-4 padding">
<h1 class="animation animated-item-1">Central London's leading Laptop Repairs Specialist Since 1986</h1>
<div class="pra">
<div class="slider-img01" slide-faq="">
<div style="background-image: url('images/lap-home.png'); background-repeat: no-repeat; " class="slider-img"> </div>
</div>
</div>
<ul class="service-left">
<li>Free quotation while you wait</li>
<li>Safe data handling</li>
<li>All models repaired</li>
<li>No fix no fee</li>
<li>Collection available</li>
</ul>
</div>
<div class="col-sm-4">

<div class="contact-us-now">

<h1>Quick Enquiry</h1>
<div class="contact-box-insite">
<form name="contact_now" id="contact_now" method="post" action="sendemail.php">
<p>Fill in the form below for a quick quote</p>
<input id="fname" name="fname" class="font-color" placeholder="First Name *"/>
<span id="fn_name"></span>
<input id="email" name="email" class="font-color" type="email" placeholder="Email *"/>
<span id="ei_mail"></span>
<input id="phone" name="phone" class="font-color" placeholder="Phone *" onKeyPress="return isNumber(event);"/>
<span id="tel_name"></span>
<input id="makemodel" name="makemodel" class="font-color" placeholder="Make & Model *"/>
<span id="e_makemodel"></span>
<textarea name="mes" id="mes" class="font-color" rows="" placeholder="Enter details of fault for a quick quote"></textarea>
<input type="hidden" name="url" id="url" value=""/>
<span id=mainCaptchanyu>
<input id=mainCaptcha class=live_captcha type=button name=cap>
</span>
<input id=txtInput class=textvalue placeholder="Captcha *"/>
<span id=cap_info></span>
<div id="recaptcha1"></div>
<span style="color: red;" id="hiddenRecaptcha"></span>
<input type="hidden" class="hiddenRecaptcha required" name="hiddenRecaptcha1" id="hiddenRecaptcha1"/>
<label id="test"></label>
<input class="input-button" name="" type="submit" value="SEND" onClick="return validaterequest();"/>
</form>

</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
 
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