Service not cancelled 5 months later!

<p>I sent the cancellation form to the required email address on 30 Nov 2016, expecting that Dec 2016 would be the last month billed as it's 1 month notice. I paid the Dec bill, but I am still receiving a monthly invoice and the amount is carrying over from Jan 2017. Luckily I closed my bank account but clearly Telkom is too incomepetent to manage 1 cancellation properly as now they are adding Payment Rejection fees to the invoice. I've sent 3 further emails, and one as an escalation as suggested by a call centre agent in Feb. I called back again today and the agent said she would help and then she ended the call. I just give up. Stop invoicing me for a service I have not consumed since Dec 2016! </p>