Sour Ice Cream Incident

My colleague and myself bought Ice Cream @ Steers Centurion and commented that it tasted sour. The owner was serving us, and responded by tasting the Ice Cream from the machine and saying that its not sour. Then she proceeded to say that it only us that have complained so far. She said that she is sorry but there is nothing wrong with the ice cream and we must please leave her store because we are disrupting her customers, even though there were no customers present at that moment. She then threatened to call security to remove us from her store if we didn't leave. We were very polite the whole time, just requesting our money back for the sour ice cream. She refused blatantly and kept saying that she can't help if the ice cream tastes sour to us. We then asked her to please throw ours out then, because we are not taking it and she said we can do it ourselves. I asked if that was the kind of customer service she provides, to which she responded \No