Hisense TV replacement

I am disappointed in the service I received from OK furnitures Zevenwaght mall. I bought a Hisense TV from them that lasted 6months. The TV cannot be fixed. Since that model is discontinued, they told me to take a TV similar in size and pay the difference that is almost R2000 or take a smaller TV that is sold at the same price. I feel that it's not my fault that the TV has been discontinued and I should be given a similar size tv