Utterly useless service!

I went to the Samsung store in Sandton City this week. I needed four appliances. I have previously supported this store for a number of large purchases, so I am a good customer and I have had no complaints in the past. But on that day, I was helped by Omasen, who really knew nothing and was totally unhelpful. I would've been better off going on the Hirsch's online store and purchasing from there (as I can see in retrospect). I needed a fridge of a specific dimension, that was only available in silver, a microwave, washing machine and dishwasher. I made it clear to Omasen that I wanted the appliances to match as far as possible. He kept trying to sell me higher models, like washing machines for heavier loads, even though I told him it's just for me. I had to be quite firm with him. We eventually decided I would get the dishwasher, washing machine and microwave in black because it looked better. I asked him if this costed more and he said no. Today the appliances were fitted. The dishwasher and washing machine don't match at all. I called Omasen and he said that's the only colour the dishwasher comes in. I looked at the Hirsch's website and they have all the appliances available in silver, for R2000 less on the dishwasher and the washing machine. That's a R4000 saving! And my kitchen would be matching. The appliances haven't been used. Can they be exchanged for the silver ones and can I please be refunded. I am very disappointed in the service from Omasen. How does Samsung allow someone like that on their floor? He's utterly useless and so bad for business. Even when I asked for a quick guide on the washing machine, he rudely asked another assistant to show me. I'm so upset!