Unable to log in to Client Wordpress site

Hey guys,

So, I have a client with URL http://www.monigalleryhostel.com/

A previous vendor handled his site but now we have no idea how to enter his wp-admin at all.

We have his cPanel login, but client has no idea about anything else. Logging in to cPanel, we can see that the site is a Wordpress site, but we're unable to access /wp-admin/ abd wp-login.php etc at all.

What could the problem be?