Bad outcome

We have purchased a Microwave oven online. After a few months, we noticed that the turntable is not working. Due to the dark glass of the door, it was only noticed late. We were requested to take the microwave oven to a repair shop in either Randburg or morningside. I declined due to the weight of the microwave and the distance/traffic to travel. It was then courier by Samsung to Randburg. I received a call from the technicians that the fault is not under warranty and I have to pay in the excess of R900. for repairs. I have declined this and was informed that I must pay for the courier to return the microwave. My defence is that i have received NO information prior of the conditions of the warranty. Also due to the darkness of the glass, this might have been faulty from the beginning. Please advice as to the progress on this