Ongoing debit order months after cancellation

I am so fed up. I phoned mtn on 1 Aug and cancelled my contract. They told me that the cancellation will be processed but since I have already paid for August my databundle will only expire on 1 September. A few days after that I was suddenly unable to use the data. Turns out they cancelled it straight away.<br> <br> I contacted them on 12 August explaining that i was unable to use my data. I finally received a response on 20 August, saying that they will do a refund on the August payment. I only received the refund on 5 September.<br> <br> In the meanwhile. Yet another debit order for September has gone off (30 August). I notified them about this on 1 September. Finally received a response regarding this on 9 Sep:<br> <br> \Good day Ms/Mrs Nadine du Preez