You may give it a try at Human Rights Committee but I don't think they will be able to assist you as your matter is already in court. Your only hope at the moment is your Embassy if they can use their contacts in the Qatari government to help you out. They can do it if they wish to.
It is indeed very sad that such cases of white collar crime takes place in a country like Qatar which boasts of a very low crime rate. Possibly, some one in the government who holds power may come to your help and put your employer in the right sense of his mind. A telephone call or two from him may be just enough to send a strong message to your employer and make him loosen up a bit.