Disgusting service from a manager at game galleria

I went to game for a nescafe 200g refill which I saw for sale online. There were no stock on the shelves. I went to the customer service desk and a lady made me wait 20 mins. She then said she was going to do a call back and when they have the stock, they would call me. I advised her that's not possible as I don't live in the area and requested a raincheck. She was confused and the lady sitting next to her Abruptly told me that they don't stock the item. I then questioned why the lady didn't tell me that initially and I felt like this other lady wanted to brush me off. I was then told that not all store sell the coffee. I explained that this was not mentioned online. The lady then continued to speak to me abruptly and I asked for the store manager. She stated he was not in and she is the duty manager. I was disgusted and walked away with her name only. I feel that she was totally rude to me and she isn't fit to be a manager if her attitude is that bad towards customers. She wasn't even apologetic that they did not have the item I was looking for. This occurred on Sunday at Galleria Game.