404 Error is given for the following htaccess Code - .htaccess

Question

RewriteEngine On
<IfModule mod_rewrite.c>
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\.elancemart\.com [NC]
RewriteRule (.*) https://elancemart.com/$1 [L,R=301]
</IfModule>
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*)$ $1.php
RewriteRule ^services/([a-zA-Z0-9-]+) service_details.php?slug=$1 [NC,L]
RewriteRule ^category/([a-zA-Z-]+) category.php?catSlug=$1 [NC,L]
RewriteRule ^blog/([0-9]+)/([a-zA-Z0-9-]+) blog/article.php?id=$1&&slug=$2 [NC,L]
RewriteRule ^verify/([a-zA-Z0-9-]+) verify.php?verify=$1 [NC,L]
RewriteRule ^services services.php
RewriteRule ^services/page/([\d])$ /services.php?page=$1 [NC,L,QSA]
RewriteRule ^funds add-funds.php [NC,L]
RewriteRule ^sitemap\.xml/?$ sitemap.php
RewriteRule ^article-sitemap\.xml/?$ article-sitemap.php
ErrorDocument 404 /index.php
I am getting 404 error when hitting services/page/([\d+])$ /services.php?page=$1
The file exists, though When I change the rewrite rule to service/page/([\d+])$ it is working fine, I need services in the URL, not service.

Answer 1

With your shown samples, please try following htaccess rules in your htaccess file. I have put 3 of services rules one after another to make it easy looking.
Also make sure your htaccess file is present along side with servcies.php file.
Please make sure to clear your browser cache before testing your URLs.
RewriteEngine On
<IfModule mod_rewrite.c>
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\.elancemart\.com [NC]
RewriteRule ^(.*)/?$ https://elancemart.com/$1 [L,R=301]
</IfModule>
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*)/?$ $1.php [L]
RewriteRule ^services/(\w+)/?$ service_details.php?slug=$1 [NC,L]
RewriteRule ^services/?$ services.php [NC,L]
RewriteRule ^services/page/(\d+)/?$ services.php?page=$1 [NC,L,QSA]
RewriteRule ^category/([a-zA-Z-]+)/?$ category.php?catSlug=$1 [NC,L]
RewriteRule ^blog/([0-9]+)/(\w+)/?$ blog/article.php?id=$1&&slug=$2 [NC,L]
RewriteRule ^verify/(\w+)/?$ verify.php?verify=$1 [NC,L]
RewriteRule ^funds/?$ add-funds.php [NC,L]
RewriteRule ^sitemap.xml/?$ sitemap.php [NC,L]
RewriteRule ^article-sitemap.xml/?$ article-sitemap.php [NC,L]
ErrorDocument 404 /index.php