Still Deducting Money: 2 Months after Line closed

Why does Telkom receive 1 star, because it is the minimum!!! My first request through Telkom channels to cancel my line was in November 2018. Nothing then happened. I again logged the query to close the account. At the start of April 2018, my phone line was cancelled. I then also received an email that the case was closed. Yet, you continue to invoice and take my money for a service that has been cancelled for 2 months now!!! Pay back the money and cancel the debit order!!!!