Failed to pay interest on late filing for a.y. 2012-13

Hello,

For the A.Y. 2012-13, i paid income tax via e-payment from the website incometaxindia.gov.in on 30th aug 2012.However, i failed to pay the interest component for late filing of tax return. Now there is a difference in the challan amount and ITR-V. For this reason, the status is shown as return uploaded. it is not processed yet. how can i rectify this? whether i shall pay interest for interest. if so how shall i pay and what amount? Please help...