Index Page Showed on All Pages In Directory - .htaccess

Question

We are using a CMS called ExpressionEngine.
We have template/folder called Contact - that has and index file. We only have the index page for contact because we have no deeper URLs that we need for Contact.
However if you add anything to the end of the normal contact pages URL it loads the same content at the contact page but isn't redirects and keeps the random URL.
Example:
This is the correct URL and displays the index content:
http://www.example.com/contact/
These are incorrect URLs (that still work - everything works) and it displays the index content:
http://www.example.com/contact/kjhfd/
http://www.example.com/contact/kjhfd/kljhdf/
http://www.example.com/contact/f/
We want that to stop and 301 redirect to http://www.example.com/contact/.
I have tried RedirectMatch with htaccess - I've tried 301 Redirect in htaccess and I've tried a funky PHP if redirect - none of which have worked so far
We have no PHP redirects. We have many htaccess redirects, please see below:
RewriteEngine On
#Trailing backslash
RewriteBase /
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ https://www.example.com/$1 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ $1/ [L,R=301]
RewriteCond %{HTTPS} off
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^ https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
RewriteCond $1 !\.(gif|jpe?g|png)$ [NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php?/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* [QSA,L]

Answer 1

A quick and easy fix is to check for the segment_3 in the URL,if it exist then redirect to contact index page.You can use {redirect} tag.
{if segment_3}
{redirect ="/contact"}
{/if}

Answer 2

You can use the following handler in htaccess :
RedirectMatch ^/contact/.+$ /contact
This will redirect a url with trailing path(s) to the correct location
/contact/foo
to
/contact