Regarding gst bill

Hi  my Ex accountant comes  CA was made a mistake on filing my gst bill...on  ( suptmbr 2017 bill)gstr 1 and 2 and 3 ..he is not field that bill which is billed for to my customer..and  I gotta a mail from my customer that regarding input tax credits ( that bill made in suptmbr he is not showing that in gst port ) and he did one more mistake that he done the invoice same number for 2 invoice  and one is all ready field GST R..please help on this to solve the problem     Thanks and regard