Disgusted by the treatment at bootleggers

I bought a bottle of coke light at bootleggers glenvista shopping center. When I got to my desk I realized the coke was expired, so I stopped drinking it and returned it after work. When I got there, I went to the till where I paid and the lady sent me to the manager, explained she had not given me a receipt. The response I got from the manager was disgusting, she mentioned she had not had any coke light in 2months and actually started yelling at me in front of their customers. I am disgusted to have been treated like that.