What if my income tax return has been invalidated?

SIR,

I HAVE FILED INCOME TAX RETURN FOR F.Y.2017-18 (A.Y.2018-19) ON 22/08/2018.

DURING PROCESSING OF RETURN INCOME TAX DEPARTMENT HAS ISSUED ME A NOTICE u/s. 139 (9) ON 17/02/2019

BUT INTIMATION HAS NOT REACHED TO ME AS MY REGISTERED e-MAIL WAS NOT IN USE. SO I WAS NOT  AWARE ABOUT THE INTIMATION U/S. 139 (9).

NOW MY ABOVE RETURN HAS BEEN INVALIDATED BY THE INCOME TAX DEPARTMENT.

PLEASE TELL ME WHAT TO DO ?

PLEASE ALSO TELL ME CAN I FILE MY RETURN UNDER REVISE RETURN TAG ?

THANK YOU