GST error pls help

vinay (Trainee CMA) (238 Points)

01 October 2018  
Original bill &

45250+1250(transportation charges)=46500
tax @ 18%= 1250
Total= 54870

GSTR1 by seller

45250
tax @ 18% = 8145
Transportation cost= 1250
Total 54645

(error is no gst charged on transportation cost)

invoice date 12-08-2017

what can be done now by purchaser of material?