Notice for non filing of return

Hi,

Today i had received email notification for non filing of income tax return for AY 15-16 from compliaand was asked to provide respone in compliance module online.

But i had already filed a ITR on 20th March 2016 i.e before the end of the assesment year. I had also checked online site of income tax which is showing no pending action and nothing under compliance tab for AY 15-16.

Please advise now how can i reply to the notice or what action needs to be take