fire a contractor

I posted an answer to a similar question a few days ago.

Here's the link to the post: http://www.guru.com/answers/questions/273/how-can-i-cancel-a-project-that-i-had-awarded.html#.T8a4PsWvOSo

There's no official way of cancelling a project. Simply message the freelancer and notify them you no longer require them to work on it. If you paid via invoice, ask for a refund or if you paid SafePay ask them to release it back to you.

If they do not return your money, you'll need to file a dispute with Guru.