Disrespectful Owner

I bought numerous items from Rebel Fruit & Veg. I paid and walked out. Packing everything in my car when I was asked to come back inside due to an error. Rebel had placed the wrong barcode on an item and sold it for less that the sticker price. The owner called me a ***** because I did not want to pay the difference. The barcode states one price, and the system other. This isn't my fault and I should not have to pay for the owners error. Treating me like a ******** and calling me a ***** in front of everyone that day because his system was not up to date is wrong and disrespectful. I have never been treated so poorly by a store that I drive out of my way to support. I will never recommend them to anyone and will not step foot in that store again unless I get a full apology from the owner