What happened to client first? Disappointed!

I visited a Sportscene store in Uitenhage, the level of service left me stunned. I have never felt so unappreciated as a customer as the branch manager did not show any customer service s****s. I went to the store and saw a pair Old Skool Vans sneaker that was marked down with a sale tag to R399 and when I get to the till to pay, I am told its R799. "The customer's must have swapped the tags and it happens all the time", that was the manager's response...really now!? What happened to taking ownership for your store? I mean the sneakers was right at the front, close to the tills. Where were the shop assistant's when the "client" conveniently swapped the price tags. I am saddened by the way I was treated, no apology, no explanation just blamed the customer's which I happen to be, what an insult. I then later returned to the store stating my unhappiness and asking if there is anyone I could call just to see that the price tag was removed from the product and put under the keyboard to probably cover something up....WOW!! I am completely disappointed at what transpired.