Recently I heard that someone filled case against snapdeal in a similar issue where he ordered apple phone for 64 Rs. He won the case and got his iPhone for 64 Rs and also court fee he spent...
It's nor system error, it's pricing error. It's like you have selected an item and note it's price but in counter when you try to pay its price shopowner told you that you have to pay more as the price label was wrongly pasted