So Today I felt really cheap at CVS

I went to CVS to buy some discount things for school. I bought some bubbles, balls ect. When I got home I noticed I was overcharged 12.00 after saving 45.00. I still decided to go back and tell this nice man my misfortune. He was very short and said it was to bad. He said I could return the items but that's it. So after getting home I looked at the 12.00 items put them in the bag and return them. He then said he was wrong. Was I cheap?