Faulty washing machine

I bought a Defy 13 kg Top Loader machine at OK Furniture. The machine is still under gaurantee and I noticed that the power button was not working. I went to Ok Furniture to report the matter and with immediate effect they phoned Defy for a technician to come and look at the problem. The technician came and in my presence opened up the machine and found that there was a black tape inside the machine which secured that power button and he then explained to me that the machine has a "factory fault" and said he is going to order a new board with a power button to install and that he will come back in 10 working days to install the new piece. After he left I then called the manager at OK Furniture and explained what was I was told by the technician, she then said to me according to her knowledge if the machine has a factory faul that machine needs to be changed not repaired. They (OK Furniture) called Defy and asked them to change the machine bt Defy insisted on repairing it. 10 days has passed and Defy technicians are nowhere to be seen and I am left with a non working machine.