Disappointed

I bought 2 pairs of jeans and 2 caps on buy one get one free. One pair of Jean was R699. 00 and the other one was R699. 00, a cap wa R199. 00. To my understanding and their explanation you get the cheapest free. Guess what they did instead of giving me one Jean and 1 cap free they gave me two caps for free. I contacted the store and unfortunately they are not willing to hear me, I wanted to return the items and they saying items on sale are not to be returned. I can't believe there are stores who still say no return nor exchange. Tape with the quality and their prices range should do something about that policy. If they can't refund at least allow exchange