Questionable consumer practices

I don't understand how a reputable shopping centre can sign a lease agreement with a tenant that does not treat customers fairly nor have the correct store policies in place to protect us as consumers. I bought a charging cable at the repair desk and got nothing else but the card slip. Two weeks later the cable is not working and they refuse to give me a refund. They keep asking me for the box which I threw away because honestly who keeps boxes for such small items. He tells me that there is no warrantee or guarantee no refund and no exchange for that. I asked how I was going to know because he did not inform me verbally upon purchase nor is it written anywhere in the store. Furthermore I did not receive a proper invoice with all the T's & C's written at the back for my protection as a consumer. If these are the kind of store Mall of the South is exposing us to I would rather take my money elsewhere. I want my money from the repair desk and will never ever buy from there again and will tell everyone every time I get the chance!!!