Telkom over due debit orders

I had a contract with telkom and it ended more than a year ago, yet the debit order is still going through. In October 2019 i went to telkom store at the glen mall in jhb to ask why and i was told when the contract end i must cancel the contract as it doesn't cancel automatically. Then i thought maybe i missed it on the contract i signed and then ask him to cancel it of which he did and tell me that the last debit order will go though in November or December. Of which it still go though in January and now i received an invoice that they will still debit. Like really ! I called customer care and was told the account as cancelled but still open. What is that. If i knew this before i take the contract with them i wouldn't have taken it. It's so frustrating that they taking you money for something you don't even use. What am i paying for. I worked at the bank and i hear a lot of customers complaining about this but never thought it real. But its happening to me. When you call you hold and hold and you will be told to hold again. I just want telkom to stop debiting my account i can do a lot with that R200. I don't want to be reversing the debit order because it will affect my credit. Telkom please stop!!!!!!!!!!!