Custom fields not retrieving data

HI again, our website uses custom fields to extract data for use in a contact form.
Contact form 7 is using a value based on a “branch name” field. each branch of our organization has its own page, with details. Something which is now not occuring is the “get branch name” function. As i’m new, i’m learning on the go about custom fields.
It looks to me like the text in the page is trying to get data using ACF plugin, which we dont use. How can i make it so that it just uses the standard custom field query (i think thats the name) to get the data. Below is the extract from a sample page (deidentified some of the words)
Thanks

<!– wp:html –>
<h5>Instructor: JOE BLOGGS</h5>
<div class=”brAddress”>
<h4>ABC [acf field=”branch_name”]</h4>
<p>JONES Primary School Hall <br>
Cnr JONES Drive and JONES Road, JONES, VIC 3111</p>
</div>
<dl class=”schedules”>
<dt>Class Schedules</dt>
<dd>Friday</dd>
<dd>6:00pm to 6:50pm Children (6-12yrs)</dd>
<dd>7:00pm to 8:30pm Seniors (12yrs and over)</dd>
</dl>

<!– /wp:html –>

<!– wp:html –>
<p><!–
Custom Fields branch_name and branch_email are used by the Contact Form
–><br>[expand title=”</p>
<h4>Contact form</h4>
<p>” tag=”dt” trigclass=”tt5″]<br>[contact-form-7 id=”1429″ title=”Contact form 2 param”]</p>
<p>[/expand]</p>
<!– /wp:html –>