Out of stock on advertised products & bad service

I went to westwood mall monday 23rd November 2015 to the game store. After looking around for items i needed, i found hardly anything. I then asked an assistant to help me look for the items that were advertised, he told me he is coming back just now as he is helping somebody else. He walked straight over to his colleagues. He had a good conversation with them, laughing as if i was not there. frustrated, i asked another guy to help me. He helped me get the things i needed however, most items were out of stock. The sale was only due to end a week later so the store should have stocked up. Their staff need to be taught good etiquette and manners and be more helpful !