Refused to refund, or beat the price

We purchased an explora on Saturday for extra view. When our installer came on Sunday we were told that we need a smart LNB otherwise the decoder will not work. We packed the decoder in it's packaging and went back to the store where we were not helped at all. They refused to refund us due to the seal being broken, but we obviously had to open it like any other customer would. We had also learnt that Game is selling the decoders for the same price including the smart LNB, yet the store refused to beat the price. Not only did they refuse to refund us but the staff had terrible customer service manners. Where do you stand in the store laughing at your customers.