Double Gst invoice

GIRISH GUPTA (ASSTT. MANAGER ACCOUNTS )   (31 Points)

11 June 2018  
Dear experts,
I have issue 2 Gst invoice of single transaction by mistake in may 18. now customer refusing to accept it and did not issue debit note against second bill. I have filled my GSTR 1 for may 18. how to cancel second invoice/ correction in GST return.