Mtn robbing me

My bill is now r4500 or more even and still no one is contacting me IS THIS REALLY MTN. THE WORST SERVICE IVE EVER EXPERIENCED. THE LAST CONSULTANT I SPOKE TO WAS WHEN I HAD TO CALL YOU AND SHE CONFIRMED MY BILL IS INCORRECT YET STILL NO ONE IS ASSISTING ME.I WILL NOT ADVISE ANYONE TO OPEN A MTN CONTRACT DUE TO ALL THIS THAT IM GOING THROUGH.