Consumer Redressal

i want to change my post paid connection of idea of above mentioned number in to prepaid. For which i had gone for ideas authorised center behind meerut university. There was one fellow called naman refuse to change my post paid number into prepaid number because he is demanding for permission from taxsila public school my previous institution. Now how it could be possible for me to provide and why. This number is on my name and I am paying the bill and I want to change it in to prepaid and I am providing the required document i.e. voter id and my photo graph. Than why the company is harassing me by doing so. Please help me either to change my connection in to prepaid or to disconnect it.