Poor after sale service

Bought a can of hunters gold from the Pretoria north bottle store last night from few sip it tasted awful and went back again to return it,supervisor was in the food store the poor shelf packer had to go up and down to ask whether it can be exchanged or not as it tasted as if its expired. She agreed on the exchange and we asked am i not getting a complimentary drink for that inconvenience he had to go back to ask her which she refused. My issue is that she wasn't keen to come to the bottle store to resolve the matter and i actually went to the food side where she was standing with her arms folded and i informed her that i am taking this forward as her after sale service service is bad and she was very rude in her response that i can go ahead and report her asked for her name and surname she only gave me her name which is Ina on request for surname she answered she is entitled not to give me her surname as she is the store manager. She was not apologetic that i drank a canned alcohol that is spoiled that can have an adverse effect on an individual health that can lead to alcohol poisoning