Impact on revenue and service tax cancelled and reissue at diiferent period with diffrent rate

srao cmts (12 Points)

15 June 2016  
Dear Sir, This is regarding leased out tower sharing to other private operators.invoices were raised in 2013 remains outstanding. Service tax amount have been paid @ 12.36%. Operator now wants to make payment now. due to Cenvat credit issue they now request to raise the bill at current rate ie 15%. please guide us on its effect if we cancell and raise invoice at current rate both on revenue and service tax . with regards jrose