Jiomart — Display Rate Vs Billing Rate difference

I saw a Golden Harvest Rice 5 Kg @ Rs. 325.00 with MRP. Rs. 750.00 in display but when I billi at counter it is coming Rs. 375.00, I object it but the executive said Rate change display not done you have to pay as per computer bill, I have no problem to pay as per bill but Should the customer come to the counter everytime to verify the rate of each item and then buy the goods? Please clarify...
When I tell the security I will complain this in your site/customer care the guy said nothing will happen if you complain..