Links to information about Public Information Officer (PIO) for various govt ministries & departments :

Information about RTI on various ministries

Official link where you can file appeal / complaint on rejection of RTI application:
http://rti.india.gov.in/rti_direct_complaint_lodging.php

Official link to file second appeal if RTI application rejected:
http://rti.india.gov.in/rti_second_appeal_lodging.php