Unhappy customer, ridiculous exchange policy

Received a gift from The Space Gateway at R1079. They stated no refunds so i decided to exchange it for something else as i had no choice. I chose an item for R1050. Was told they cannot give me the difference, i had to take something else and pay the top up. The cheapest item was a purse the size of my palm for R145. Mind you, i had come to do an exchange and was not willing to spend any money. I refused and told them keep the credit of R29. They insisted they cannot. (Which shop refuses to take free money that I'm giving them) Eventually i said give me 15 paper bags at R2 each that they use to pack purchased items in, i will pay the difference of R1. They yet again refused and said they can't allow me to buy their bags to put other items i may buy and walk around the mall with it. I said fine, I'll buy the bags, pay for it and they can keep it and use it for their customers. They yet again refused. I asked to speak to the manager, they phoned the manager and eventually tell me unfortunately it gets worse, it's a sale item and they cannot even exchange it. I wasted 1 hour in that store. The item i received as a gift was so cute, i just wasn't happy with the fit. The item i wanted to exchange it for was a bag that was also so cute. Just wish they didn't have such a ridiculous policy. I will be telling everyone i know to never ever buy from The Space.