CELL C MI ASSIST *******

I AM HIGHLY DISAPPOINTED WITH MY CELL C SERVICE SPECIFICALLY WITH MI ASSIST, I HAVE CALLED IN 3 TIMES TO CANCEL THIS SERVICE CAUSE IT'S NO USE HAVING IT BUT I'M STILL BEING BILLED FOR THIS EVEN THOUGH I SPECIFICALLY STATED TO THE AGENT THAT THIS SERVICE IS OFF NO USE TO ME AND THE CHARGE FOR THIS SERVICE IS ABSOLUTELY TO HIRE, WHY AM I BEING BILLED FOR SOMETHING I DON'T USE AND HAVE ALREADY CANCELLED AND MONTHS LATER STILL BEING CHARGED, IS THIS HOW CUSTOMERS ARE TREATED AND CHEATED OF THEIR MONEY, IM SO FURIOUS