And is there a specific code in the constitution which protects me against this kind of wrongful termination?
Response: There is no specific code in the constitution in relation to your case. However, your rights to enforce the terms of your contract are protected under basic contract law.
Also, if this goes further, can I submit a complain to the US State Department or the accreditation or committee? Or who would I talk to next?
Response 2: Apart from the entity that you mentioned and you seeking redress in U.S. Courts, I cannot think of anyone else that you would speak to next.