Bad Customer Service

I bought a Samsung Fridge model NR.RF67DEPN1/XFA witch cost me R15000 three years back.It started giving me problems so I contacted Samsung and they send out a technician witch I had pay for.This guy just came to defrost the ice that build up in the back and that was it. However he did tell me the problem is one of the sensors that is faulty he mentioned it will cost me about R700-900 for that sensor. So I contacted Samsung to tell them how I feel about this unit only lasting me 3 years and needed repairs that I must pay for. They reply via email was that they cant do anything about it, but they offered me a coupon so that I can purchase the same fridge for half the price. So that mean ill be buying a new fridge every 3 years now. Come on Samsung I think you can do better than that. I've had a LG fridge for 10 years never give any problems and its still working at the moment.All my appliances in my house is Samsung brand even my Laptops and Phones and this is how u tread a good customer. I really think that this is a factory problem and you should replace this unit. Awaiting your response.