MTN Incompetency and not cancelling contract as requested

Dear MTN, Due to frustration and incompetency of MTN experienced in numerous MTN shops and the call centre I raised a complaint on this very same social media platform on the 26 August 2018. In this complaint I have instructed you as MTN to stop my out of contract internet line ********** . In the interim I have cancelled my debit order after making a payment even in September 2018. This morning I received a notification that I owe MTN R280. There is no way that I will pay this amount. I will also notify your directors during the day that I will not pay this amount and that MTN is ***********.

Regards, Mr F.J du Preez