reply of notice of non filing gst 3 b return

mudit gupta (CA) (330 Points)

03 February 2018  
Dear sir
with respectfully I like to say that I close My firm on 28-06-2017in vat due to death of proprietor and I close My firm in gst on dec . department issue notice on My email id to submit your Return but I close My firm in gst so My login is not open .so how to reply to AO.
plz guide me on this issue and provide format of reply of notice
REGARDS
MUDIT