Styles For Less

Yesterday I went in and found what I was looking for — at a decent price. As I was walking to the register, I grabbed a hair bow and headed to check-​out. When I got to the register, the cashier mentioned that bows were buy one, get one half off so I decided to go back to the rack and check out more bows. I grabbed one identical to the one I originally got to compare to others and I finally decided I just wanted one bow — the one I originally got. By the time I got back everything was placed in the bag, and I handed her the identical bow saying «I just want this one». When I walked out to my car I looked over my receipt and saw that she charged me for 2 bows. I look in the bag, and there they are, 2 of the same bows.
I walk back in immediately saying that there was a mistake and that I did not want the second bow (they were the same too??). Another lady intervenes and says there is nothing she can do but exchange or give me store credit. Agitated, I say «I was here not 2 minutes ago» and she responds saying it’s not possible to give me a refund. At that point I just exchanged the other bow.
Although I should’ve checked the monitor on my side to make sure all was right, I really didn’t think anything was going to go wrong buying 2 items. I feel like the cashier should’ve waited to bag everything or at least made sure I wanted two of the same bows.
The fact that I came back in immediately after I walked out with a mistake that wasn’t entirely my fault, and still didn’t get a small refund, makes me not want to go there again.
2 * for finding the blazer I wanted.