Cash crusaders Three Rivers will de***** you

I am utterly disgusted at the service provided at cash crusaders Three Rivers. I came into the store today with the intention of buy a router, firstly the gentleman didn't seem to know anything about them. Then we showed him the router we wanted to buy, and we asked him why it didn't have a box or manual for setup and he said it's sold as is. When I ask him to set it up in store to prove that it works he said the store is in a mall and due to concrete they cannot test the product. Which is nonsense. When I got home I am unable to step up the router as the default password on the router itself does not work. I believe that the gentleman sold me a router has was blocked that's why he also could not authenticate it in store and opted to use a lie and say "due to concrete, we can't test the product if it works". I deserve an exchange or a refund . I can't just flush R800 in the toilet because I was sold an item that doesn't work.