Impossible to cancel landline!!!

Cancelled my landline online on 3 June 2018, it is still not cancelled and I am still getting billed. There are no Telkom helpline numbers to call to try and get this sorted. The online chat consultant Amanda Phelako was not very helpful either. She just sent a mail to "someone that will contact me at some time". She did not answer any of my questions and refused to provide contact details for the cancellation department, if there is such a thing. Worst customer service ever!