Please supply all your input in the Form section of the CF7 interface (add as code or include as link to screenshots).
<div class="contact--form cf">
<div class="row">
<div class="columns small-12 large-4">
<span class="error form-error">Please fill in this field</span>
<label class="show-for-sr" for="field_firstname">First Name *</label>
[text* field_firstname placeholder "First Name"]
</div>
<div class="columns small-12 large-4">
<span class="error form-error">Please fill in this field</span>
<label class="show-for-sr" for="field_lastname">Last Name *</label>
[text* field_lastname placeholder "Last Name"]
</div>
<div class="columns small-12 large-4">
<span class="error form-error">Please fill in this field</span>
<label class="show-for-sr" for="field_email">Email*</label>
[email* field_email placeholder "Email"]
</div>
</div>
<div class="row">
<div class="columns small-12 large-6">
<label class="show-for-sr" for="field_company_name">Company Name </label>
[text field_company_name placeholder "Company Name"]
</div>
<div class="columns small-12 large-6">
<label class="show-for-sr" for="field_phone_number">Telephone Number </label>
[text field_phone_number placeholder "Telephone Number"]
</div>
</div>
<div class="row">
<div class="columns small-12">
<label class="heading--label">Select your areas of interest:</label>
[select* enquiry
"Volunteering|craig.england@hookson.com"
"Fundraising & Donations|fundraising@edch.org.uk"
"Rehome a Dog|boarding@edch.org.uk"
"Rehome a Cat|boarding@edch.org.uk"
"Boarding|boarding@edch.org.uk"
"Media & Marketing|media@edch.org.uk"
"General Enquiries|boarding@edch.org.uk."
]
</div>
</div>
<div class="row">
<div class="columns small-12">
<label for="field_message" class="heading--label show-for-sr">Message</label>
[textarea field-message placeholder "Message"]
</div>
<div class="text-center columns small-12">
[submit value="Send" class:btn class:btn--secondary"]
</div>
</div>
</div>
The form at the link you supplied looks like a static HTML form rather than a CF7 form & does not match the form the form you supplied.