Website been hacked?

One of my client's website's have been hacked and unfortunately, the automatic backup that I had in place didn't work. Actually I see there's a backup on the server with GoDaddy, which I have restored, but the site is still having issues. After running WPMU Defender, I begin to fix some issues based on the recommendations; however, the load.php file appears to have been modified and attempting to repair it using Defender isn't working. Is there anyway I can fix this issue?

Also, if it helps, I am granting access in advance.

Lastly, I would like to know what was done to resolve the issue.