return wrongly filed

Ankit Agarwal (Senior Executive) (36 Points)

15 September 2018  
if GSTR 1 and 3b is wrongly filed for March and no sale and purchase were shown.infact sale and purchase was there.
one party to whom we sold goods could not take credit because we have not shown goods sold to them in return.
can we show match sale and purchase in augustvreturn so that can avail credit?