FAULTY HI FI

I RETURN MY HIFI FOR THE 3RD TIME IN THE PAST YEAR AND A HALF FOR REPAIRS, I HAVE PROBLEMS WITH IT SINCE I BOUGHT IT. I RECEIVED IT BACK LAST WEEK AND THURSDAY THE 25/02/2016 AND STILL IT DOESN'T FUNCTION LIKE IT SHOULD, I DID SPEAK TO THEM ON PREVIOUS OCCASIONS AND ASK THEM IF IT IS NOT POSSIBLE TO REPLACE IT WITH A NEW ONE THE LAST TIME THEY SAID TO ME IT MUST GO IN FOR REPAIRS FOR 3 TIMES AND IT WAS NOW THE 3RD TIME AND NOW THEY TOLD ME AGAIN THEY WILL CAME AND FETCH IT FOR REPAIRS I AM FED UP FOR THIS ISSUE. IT IS NOT THE FIRST ITEM I BOUGHT THAT WAS FAULTY FROM DAY ONE.