Gstr 3b output shown as interstate instead of intrastate

Sunil Kumar (7 Points)

15 October 2018  
Need one help my august month invoice seller have given me cgst+sgst invoice instead of igst it was intrastate purchase...and I have filed it also like seller have given incoice as interstate in gstr3b and claimed itc ...but seller have not filed his gstr1 how to Rectify this mistake