Unfriendly supervisor

I was there on yesterday I bought a lot of grocery and I took a bag of buttenut it was R20 when I arrived at the till point the butternut was now R40 I told the cashier and the cashier she will call the supervisor,the supervisor came and she said to the cashier those ones are finished and left, she didn't greet me and explained to me or ask if do I still need the product.Her service is very bad hey I don't think I will to the store again.