For information with regards to withdrawal of the legal tender character of High Denomination bank notes of Rs.500 and Rs.1000, Kindly visit the below given links
https://rbi.org.in/Scripts/FAQView.aspx?Id=119 - Frequently asked Questions (FAQs)
http://finmin.nic.in/press_room/2016/press_cancellation_high_denomination_notes.pdf - Press Release
http://finmin.nic.in/172522.pdf - Gazette Notification
http://finmin.nic.in/172521.pdf - Gazette Notification