FAULTY BAD QUALITY TV SOLD TO ME

I am extremely ANNOYED with the service I received, I bought a plasma from Lewis in BETHLEHEM branch last year and within 6 months it was taken to repair AGAIN NOW IN MARCH IT WAS NOT WORKING AND TAKEN TO REPAIRS AGAIN!!!! TO DATE I STILL DONT HAVE A TV IN MY HOME AND I AM STILL PAYING FOR A FAULTY TV. I FAILL TO UNDERSTAND WHY CANT THEY REPLACE THE TV WITH A NEW ONE THAT IS WORKING . and what frustrate me when I go to the store and enquire about it they keep on referring me even the manager on Monday 02/05/2016 when I enquired she couldn't give me an update in instead she gave me a contact details to call the other person as if I am personally liable for a faulty TV, In future warn potential client that they are purchasing second hand items in your store