Bad Service and bad Labeling

On the shelf the price for the Avalanche Red Gel Shot Blaster showed R99.99 there was no other indication that it was not that price as the item was paced directly under the R99.99 price label, i went to the till to pay for the items and it scanned R799.00 each i informed the cashier that was not the price shown on the shelf they went on to call a manager to assist. He said he cannot give the items for me at the price given i told him that that is the price shown on the shelf so that is the price i as the customer should get and he just said he cant.