accused of price changing

i was buying a school bag for my son and could not find a cars trolley bag any where else. when i walked into the checkers branch ladysmith i found it the last one. i took it and proceeded to complete my shopping and then to the till. after paying for my goods bag included i was stopped by a security guard and was told that i have changed the price of the bag.<br> to cut ti the chase i was taken to the managers office where i was asked to empty my pockets and with any explanation was told to pay in a further a certain amount for the bag. <br> they are ****ing *****es and hoes who treat their customers with less dignity.