Lic Of India — amount returned without any interest

dear sir,
i submit proposer deposited of Rs. 8640/- on dated 31/03/2004 and doc. no. 13697. therefore this policy is not done for some reason, therefore i submit an application for refund money on dated 5/02/2009. then the amount is refunded on dated 29/07/2009 without giving any interest of Rs. 8640/- for the years.
therefore i request you to give the interest of the deposited amount from the last 5 years from the date 31/03/2004. to 29/07/2009. so inquire the matter and reply me as soon as possible.
thanking you,
phool chand agarwal
c/o sajjan cloth stores
31 clothes market
tinsukia, assam
mbl no. [protected]