W3 total cache not working in nginx server

Hi All,
I own a website name customerservicehub.in and I have installed wordpress w3 total cache plugin with nginx server.

This is my nginx conf for domain

server {
        server_name customerservicehub.in;
        root /server/customerservicehub.in/public_html;

        index index.php;

        include global/restrictions.conf;

        ##SITEMAP RULES WITHOUT CACHE
        location ~ ([^/]*)sitemap(.*)\.x(m|s)l$ {
        rewrite ^/sitemap\.xml$ /sitemap_index.xml permanent;
        rewrite ^/([a-z]+)?-?sitemap\.xsl$ /index.php?xsl=$1 last;
        rewrite ^/sitemap_index\.xml$ /index.php?sitemap=1 last;
        rewrite ^/([^/]+?)-sitemap([0-9]+)?\.xml$ /index.php?site$
        rewrite ^/news_sitemap\.xml$ /index.php?sitemap=wpseo_news l$
        rewrite ^/locations\.kml$ /index.php?sitemap=wpseo_local_kml$
        rewrite ^/geo_sitemap\.xml$ /index.php?sitemap=wpseo_local l$
        rewrite ^/video-sitemap\.xsl$ /index.php?xsl=video last;
  access_log off;
}

##SITEMPA RULES WITHOUT CAHCE ENDS

# Additional rules go here.

#including w3 totalcache rules here
include global/customerservicehub.in-w3tc.conf;
# Only include one of the files below.
include global/wordpress.conf;
# include global/wordpress-ms-subdir.conf;
}`

<blockquote>My conf for w3 total cache</blockquote>

# BEGIN W3TC Page Cache core
set $w3tc_rewrite 1;
if ($request_method = POST) {
    set $w3tc_rewrite 0;
}
if ($query_string != "") {
    set $w3tc_rewrite 0;
}
if ($request_uri !~ \/$) {
    set $w3tc_rewrite 0;
}
if ($http_cookie ~* "(comment_author|wp\-postpass|w3tc_logged_out|wo$
    set $w3tc_rewrite 0;
}
if ($http_cookie ~* "(w3tc_preview)") {
    set $w3tc_rewrite _preview;
}
set $w3tc_enc "";
if ($http_accept_encoding ~ gzip) {
    set $w3tc_enc _gzip;
}
if (!-f "$document_root/wp-content/cache/page_enhanced/$http_host/$r$
  set $w3tc_rewrite 0;
}
if ($w3tc_rewrite = 1) {
    rewrite .* "/wp-content/cache/page_enhanced/$http_host/$request_$
}
# END W3TC Page Cache core

<blockquote>This are the permissions i set for wp-content folder</blockquote>
drwxr-xr-x 9 www-data www-data 4096 Jun 16 15:04 wp-content

Can you please resolve my issue as to how would i be able to make w3 total cache work.
I don’t find any cache files in cache folder of wp-content.