Return policy at Game!

I am so frustrated by Game store service! I purchased a Mobicell phone in Grand central cape town and after a 2 hours realised that I had bought an incorrect phone. I asked Cherilyn who works there if I should want to take it back May I do so, she rep**** that we can do so as long as we have the slip. The phone was unused and since I had already moved closer to where I stay I thought I should just take it back to the Game store where I'm closer to at N1 City . They are rejecting the phone and won't take it back although it has been unused. They say they can't take back a phone that's out of box whereas it was taken out the box at the Game store. Even of I signed a guarantee, I feel that it is misleading and I'm in a position that I can't even deal with the floor manager Kasheifa at Grande central town as she won't be willing to listen at all. The return policy is not at all clear and I So frustrated!