The worst service ever!

I bought a unit which, when I got home, found out that is was broken. I immediately returned it to the store and the service agent told me he cannot exchange it as he is not sure if it was like that out of the box or if I had broken it (with a very nonchalant attitude). I had to wait for a manager. Eventually - a month later, I got a message to say that I need to collect another unit as the supplier admits to an exchange. When I went back to collect it, I stood there infront of them for 30 minutes without even a \hello\" from them, they simply carried on with what they were busy with as if I wasn't even there. Eventually I left, still without my unit. Their staff need a serious training in customer care!"