STILL BEING BILLED EVEN AFTER CONBTRACT TERMINATED

I HAVE CANCELLED MY CONTRACT AND PAID IT OUT OVER 4 MONTHS AGO AND AM STILL BEING BILLED. I KEEP PHONING AND GETTING NO RESPONSE EXCEPT FIRST TIME WHICH I WAS PROMISED SITUATION WOULD BE RECTIFIED. SINCE THEN MY CALLS AND EMAILS GO UNANSWERED OR UNRETURNED. I AM AT MY WITS END AS NO ONE GETS BACK TO ME. THIS IS RIDICULOUS. HOW CAN A COMPANY TREAT PEOPLE SO BADLY!!!<br> <br> cell ***