Rerating at Billing Time

Hi,

we are using pipeline rating to rate the events. i have configured my price model like below

Eg :- Rate Plan1

               1 Rupees  per Minute ( GSM)

               2 Rupees per MB ( GPRS)

At month end i have to check the total used minutes / mbs for the customer then i have to rate like below

if total used minutes is more than 10000 Minutes ( At biling time ) then i have to rate 0.50 Paise per minute &  if total used mbs is more than 10 GB then i have to charge at 1 Rupee per MBs.

How i can rerate the events at Billing time ?

If i am rerating the events then how we will manage the balance impacts ?