Pick 'n Pay rude manager

Hello. I went to Pick 'n Pay liquor at Diepkloof Square to purchase the Tanqueray that's on special for R219.00 (this includes a glass), however, the value pack was not there, but the signage was displayed (in my knowledge, a store only displays products that are available in store). Then I called one of the consultants to ask about the pack, then she said it was not there, in an unprofessional manner, I then asked her to call the manager, of which she did, then he approached me in a very disrespectful manner, with his hands in his pocket, when I inquired about the promotion, he told me that it is not there with an attitude, then told to either buy the product or go elsewhere. He also said that I came to the store to perform and not to buy, he said that I didn't have money and that is why I came to the shop to perform and walked away busy shouting.