Incorrect pricing

Attempted to order on mobile app , item was priced at R3462 but when I checkout the item was marked for R5899 in my cart , I called and was told to email a screenshot , then was told to go ahead with EFT and the price will be corrected , was then unable to book as the item was sold out but the same item was then marked for R5700 , called again several times and was eventually told that the original item was old stock <br> My query is why was the original price not honoured as the fault was not with me but your app? And the time taken going back and forth to your call centre?