have wrongly uploaded tally invoice no. (rest everything is correct, tax amount, date, party name, gst no. Etc) In gstr1(quarterly) from july 2017 till March 2018 so tell me how to rectify because now some invoice no. Are not accepting because system is showing error that they are already there in gstr1 of previous periods. 

The whole issue is this until now we use separate bill book for sales gst with Bill no. 1 as 1st invoice and enter it in tally sales Ledger but mistake from our side was that earlier to gst there was vat and in tally vat Serial no.s was used so 27 bills were there in vat before gst so tally took 1st gst invoice as 28 whereas actual invoice billed to receipient is 1 but since we uploaded the gstr1 offline using Tally json file it took bills starting from 28 from July and now situation is this that I can't add invoice in gstr1 as it's not accepting bill it returns error as duplicate bill.