Bad Attitude from Store Manager

I visited one of the Game Stores (West Coast Mall, Vredenburg, No: 301) on the 15th May 2015 to purchase a new Flat Screen LED TV to the value of R14,500. The sales person that assisted me was very helpful. I gave him a similar quote from a Samsung Store and he did all the necessary checks and informed me that they will match the price of R13,950. I was very happy and continued with purchase, however when I was in the process to pay, he informed me that the Store Manager (Andrew de Jager) declined the price match. I then spoke to him regarding his sudden change of mind, but all I got was bad attitude and that his the manager and have the final say, also he was not even bothered to explain, just walked off. I am very disgusted in the way this Game Store Manager treat his loyal customers. Is this now the way Game is conducting business, telling you yes and then 10 min later no?