Notice under GSTR 3A

Radhanath Parida (Article Assistant) (149 Points)

03 June 2020  
I got a notice of GSTR 3A for not filing of GSTR 3B for the month of march,2020. But the due date of GSTR 3B is extended upto 30th June due to COVID 19.
So how the department sent that notice ?
Should I wait till the due date or file the return as early as possible ?

Please help...