India Post — Speed post not delivered even after 3 weeks

Address:	Kolkata, West Bengal
Website:	www.indiapost.gov.in

Hi, I mailed some documents via speed post on 4th September and it's more than 3 weeks now, the documents didn't reach the destination and moreover india post is unable to say anything about this and why it is not reached. There were very important documents and if not delivered then I will have to lodge complaint in consumer forum.