Not Receive Rto Book — delay in delivery and non traceability and bad behaviour of post master

Address: Valsad, Gujarat

My father had sent me an urgent document on 4th may 2010 from Kolkata bearing shipment no SPEW[protected] and its already 5 days of shipment and I haven't received the mail and each time I am calling the post office,the officer in-charge is asking me to contact either Daman post office or Somnath Post office or any one else.What is this?
Please look into the matter and deliver the letter immediately as its really important.I am begging you kindly do the favor.