CELL C NOT FIXING MY PHONE !

SINCE RECEIVING OUR BLACKBERRY PHONES IN JAN / FEB 2015 MY HUSBAND AND I HAVE HAD CONSTANT PROBLEMS WITH OUR PHONES. IT HAS BEEN IN FOR REPAIRS NUMEROUS TIMES. THE 1 UNIT SEEMS TO BE OK FOR NOW, AFTER FINALLY RECEIVING IT BACK IN JANUARY AFTER MORE THAN 1 MONTH WITHOUT OUR PHONES - THE OTHER WAS SENT PROMPTLY BACK TO CELL C YET AGAIN AS IT WAS STILL POWERING DOWN BY ITSELF. WHEN BOOKING IT IN AGAIN I TOLD THE REPAIR & THE CALL CENTRE THAT I DID NOT WANT THE UNIT BACK AS IT IS NOT BEING REPAIRED AT ALL - I WANT A NEW UNIT. (CONSIDERING THAT OUR PHONES WERE SO OFTEN IN FOR REPAIRS AND WE HAD TO USE BORROWED OR SPARE PHONES THAT DID NOT HAVE B.I.S. WHICH WE WERE STILL CHARGED FOR - AND BEING A LOYAL LONG-STANDING CUSTOMER OF CELL-C - I DON'T THINK I'M BEING UNREASONABLE). I HAD TO FOLLOW UP AND PHONED THEM A WEEK AGO TO FIND OUT WHEN I COULD EXPECT A PHONE, I WAS TOLD I CANNOT GET A NEW UNIT BUT THEY WOULD SEND A REFURBISHED UNIT. SO I GET IT TODAY, PUT THE PHONE ON AFTER SOME STRUGGLE AND THEN HAVE A SCREEN THAT IS SNOW AND FLASHING LIKE STROBE LIGHTING... REALLY??? ENOUGH!! THIS IS UNACCEPTABLE AND I AM SO FURIOUS AND ALSO DISAPPOINTED BY CELL C. I HOPE HELLO PETER CAN HELP ME.