NOT UPDATING CREDIT RECORD

I HAVE PAID UP MY ACCOUNT A LONG TIME AGO. THEY ARE NOT UPDATING MY CREDIT SCORE AND JUST IGNORING MY REQUESTS. I CAN NOT RENT A PLACE TO STAY AND I CAN'T GET A NEW CAR BECAUSE OF THIS STUPID THING THEY HAVE ON MY NAME AT THE CREDIT BEREU WHICH HAS BEEN PAID OFF A LONG TIME AGO. CELL C HAS THE MOST DISGUSTING SERVICE I HAVE EVER SEEN. I WILL NOT RECCOMEND THEM AT ALL. YOUR COMPETITORS DO IT BETTER!