Tn vat payment after adjusting input vat

Hi,

  We have wrongly availed TN VAT Input Tax against Out Put Tax for the month of Apr'15 to June'15. We should not avail Input Tax , because it is pertaining to FY 2013-14. Please clarify to below queries,

1. Can we Pay Tax for the period Apr'15 to June'15 now?. If yes, please clarify.

2. How should we show tax payment details in return, we have mentioned Input value already.

2. We have filed Monthly Return already with in due date. What is the procedure for filing revise return as per TNVAT?