Mr Dig Vijay,
First of all, I would suggest you to check if its a Mutual Fund or a ULIP that you are holding.
In case of Mutual Fund, units purchased one cannot reduce in quantity unless redeemed / sold.
In case of ULIPs, the company allots some units in the beginning and later keep eating your units under the name of various charges.
I agree with Mr. Vikrant and Mr. Durgesh.
In my opinion, Mr. Venkatesh is confused about the value of a unit and the number of units. The value (i.e. NAV) of a unit would change everyday, but in an MF, the number of units alloted to a particular investor will NEVER reduce unless sold.
Hope this is clear now.