Invoice cancelled and service tax paid

Hi All,

I have issued an invoice in March 2013 for Rs.500000/- and have also deposited service tax in march 2013 and have not received the payment yet. Today the client called and asked to give fresh invoice for current date and he says that purchase order has been generated today. Now my question are:

1. What to do as I have deposited the service tax and recorded the income.

2. How can I issue fresh invoice for today's date

The service provided is from Aug 2012 to July 2013