inayatseliya on "wp-admin access denied"

I can't access my wordpress dashboard only thing while i get while accessing to my site hotelapexbharuch.in/wp-admin is 'Access denied."

normal site is working perfectly fine there's no change to content or as if its been hacked or something like that.

I doubt something is wrong with plugin or something
I am using following plugin for security and cache
Better WP Securrity
W3 Total Cache

after doing some searching i found out my wp-config file is missing.