Fair Price poor service

I am very disappointed, I lay-byed a 320L fridge Hisense then on Saturday I went to pay off 3 hours after I have left the shop I was told that the Fridge has been discontinued but the is a 305L that is available and they will give me that and it is the same price as the one I had lay-byed, I then asked how can it be a same price if it is 15L less than what I had requested. After I had complained at the store they gave me R240 as a compensation for a fridge I paid R7500 for. What makes me made is that a 280L same fridge is R6000 so the one I paid for 320L R7500 but got 305L for the same price. Top it all the warranty that I was given at the store was years and I receive the paper work it says 4years warranty. This was the worse purchase ever and when I called the customer support the guy was so rude I had to hang-up.