Wrong display, no return policy for perfumes.

Yesterday I tested a perfume at Edgars store Greenstone Shopping center, they displayed the perfumes in the following manner; left ( tester for her) middle ( perfume for him ) right (perfume for her), assuming that I was buying a perfume for her I took the wrong one only to find out later when I got home after I've opened it. Today I took it back because I have my receipt, but they refused to take it back they said that I removed the plastic seal. This is unacceptable because they don't have a return policy for perfumes at the back of the receipt like they do for other goods, this could have been resealed with that plastic since the box is still in perfect condition as I bought it yesterday. I am not happy about the way they displayed it on the shelf because that's what lead me to buy the wrong perfume in the first place.