A failed Telkom

So i cancelled my mobile subscription effective end August. Telkom continue to debit my account, refuse to contact me or communicate with me in any way. This is ridiculous. I have clear proof of the cancellation that Telkom just ignore. There have not been a single phone call made on the two mobiles since mid July. I have made payments up to end August. I have tried to call without response. I have used whatsapp, which doesn't work, I have messaged Telkom, which has failed to elicit any response. I have called Telkom and told they will contact me. They do not. What do i have to do to get a response and resolve this. WILL SOMONE FROM TELKOM CONTACT ME, THYEY HAVE MY EMAIL ADDRESS AND A DIFFERENT MOBILE NUMBER???