4 month old Oven not working even after fix.

I bought a new kitchen from builders warehouse in north riding.<br> Included in this was a Samsung oven and stove. Three months later the oven switched off while in use. The problem was reported to the store, the store contacted Samsung, I made it clear to both the store and Samsung that I will not accept repairs on a brand new oven and would prefer an exchange, both Samsung and builders warehouse promised me a new oven but instead a Samsung technician came over and fixed the oven while I was not home at the time. I received no feedback from either parties to say what was fixed on the oven and why I did not receive a new oven as requested. I was not happy. Within the same week the oven switched off again while in use. Now I believe my right as a consumer are being violated by both parties and for this I hold Samsung fully responsible as this is their brand on the product.<br> I spent R8600 on a new ovdn that is already unrealiable after only four months. I am very upset and I instead want a refund and will purchased a different brand ovdn from a different store. I requested an exchange but after even the repair work failed I want my money back. This is disappointing to say the least.