BAD SERVICE

I bought prescribed medication swiped cash today @ Link pharmacy shop 22 Florida Square pharmacy only to findout its not exactly neccesary anymore. Went back to ask for refund on the med but to be told its against Link company protocol. What kind of thing is that? So according to Link pharmacy if you get wrong med, its your loss.. i cannot be stack with medication i do not need because of protocol. I have spend money on this,it isnt for free. I want my money back. Even small shops gives you back if you made a mistake. Whats so special about Link pharmacy that you cannt be getting your money back. This is not right.