Can't access dashboard

So a while ago, my website (www.fleshfestfilms.com.au) was hacked by some group called 3xp1r3.

Ever since, anytime I try to log in to my website, I get this message

Index of /

Apache/2.2.24 (Unix) mod_ssl/2.2.24 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 mod_perl/2.0.6 Perl/v5.8.8 Server at https://www.fleshfestfilms.com.au Port 80

And if I try to log in, I get –

Not Found

The requested URL /admin-wp was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.24 (Unix) mod_ssl/2.2.24 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 mod_perl/2.0.6 Perl/v5.8.8 Server at https://www.fleshfestfilms.com.au Port 80

I gave up trying to fix it a while ago as my business was ailing, but now things are picking up and I need to get this running again!

Please help!