Very rude employees cost company thousands

On Saterday I bought a double door fridge from Pick n Pay Lifestyle centre in Centurion, to a cost of R 9000. There was a special where you got R5 stickers to paste on a card. After the purchase was done, we bought a few other thing and paid for it, also using the cards for the discount. Afterwards I noted that the discount was not deducted. I went to query this and was told that I was not applicable to amy items ons special. I asked a simple question on why they still take the cards if it there is no discount. They lasy, Rina, got very rude. They only thing that was left to do, was to ask for a refund on the items and also the fridge. It was ckear that Rina did not care about loosing R 10 000.