still being billed for a cancelled line

despicable service from telkom as always! I have 2 lines on my name, i put one up for cancellation almost 60 days ago already (telkom's policy is 30 days notice and therefore i paid accordingly last month to accomodate this "30 days"), after 50 days finally i got a call saying its going to be cut off which was just about a week ago, yet i still have service and still am being billed for it, ive disputed the bill, no one responds or does anything either. becoming outraged with how bad the service of telkom has become.