You have been cheated and you can simply forget the money or any action you can take against the crooks. Just be careful in future.
However, you can do many people a favour by advising readers of the name of the company, the people you were dealing with and their contact numbers. This will make readers aware of these crooks and avoid dealing with them. It may also get the authorities to keep an eye on these people. Do this by posting the information at Qatar Living.