Price increase on the fly after receiving a far lower price quote

I purchased some steel tubing today at their store in Brackenhurst. Yesterday I was given a price of R449-00 per 6M length (unfortunately I did not ask the lady for a printout of the quote). This morning when I went to pay and collect it, the manager, disagreed with the price and would not give it at that price. His answer was - "I cannot sell it at that price as I will be losing money. The price on the system is also incorrect as that is the old price and this was a special order". To me it was not a special order. He actually had the cashier adjust the price in front of me to R600-00 per length while being extremely arrogant about it. There was no word of apology except giving me the feeling that I should be grateful for his service. As soon as the price was adjusted to his liking, he just walked away without a word. I still bought the pipes as I needed them but just think of this service and adjusting prices on the fly.

My major question here is - can a shop manager just change prices on the fly due to incompetance and what is Jacks overall policy on price changes on the fly? I am now extremely dissapointed with this transaction and would like some advice on it. This should also go to Jack;s head-office,

A simply apology or we will look into it means nothing to me as at the end of the day it cost me R800 extra due to the managers arrogance and incompetance.