Poor poor poor Customer Service

Cancelled my contract in April 2017 and was told it will only be cancelled end of April 2017 as it run for 30 days. Obvious some one didn't do their job as Vodacom is still billing me. I have been calling them several times instead I am referred from one person to another, no one can assist. When you don't pay them they cut off your line, when the issue is on their side the rude agents will tell you, it is cancellation department and cancellation refers you to accounts department . This is so pathetic