Organization is rejecting me on the basis of false requirement.

I had applied for Management Trainee post under direct recruitment in the same PSU. I have intimated my department 13 days before closing date of apply and requested to issue NOC whenever required . I got selected in the written exam and on basis of my intimation, an NOC was issued stating that my department has no objection in my applying and appearing in GD and PI for the said exam. I had produced the NOC on the date of Document Verification. On basis of my NOC submission, I was allowed to appear in GD and PI. Now, in the main list, my name is missing. Even in the complete list my name is missing. From reliable sources, I came to know that I had secured 1st rank in the merit list. But, my candidature was rejected due to non-submission of proper NOC.