Airtel — Migration from post paid to Prepaid

Dear Trai,
I want to convert Post paid plan to Prepaid plan, Regarding this I went Customer care cell of airtel in bhilwara on 25/july /2009 .
Customer care Franchisee executive " Neeraj jain " Explained me that Once the post paid bill will generate on 09/08/2009, this conversion can be done .
.
Now as Bill generated for the last month on 24/08/2009, I again went to Customer care Franchisee of Airtel at bhilwara but they are not ready to convert the plan .
I request you to please intervene on the issue .
My phone details are as under :

Phone Number : [protected]
Name : Gajendra singh rathore
Company name : Airtel

Regards
Gajendra singh
Bhilwara
rajasthan