cancellation of ulip plan? wat i will get?

on 1 feb 2011 i have taken endowment plus ulip plan from lic. Now i want to discontinue this policy as i was not told about the allocation charges and other charges. i have paid 50% amount that is rs10,000.
My question is if i cancel the policy within 15 days how much amount i will get?? and waht if i will cancel it after 15 days??
urgent