GTPL — added on monthly bill after being disconnected with the connection also

My cabel operator sai cable is adding the monthly bill of rs 500 per month from last 3 month every month ian resiving the sms of monthly bill but i have chainged operator not using it and i have completed manyer times but then also operator is adding the bill and saying that you can not disconnect the connection you have pay we don't know anything but i am not even using his connection this is total # they are not even taking my complaint wow gtpl wow sai cable *