Cannot cancel Telkom account

Again I am saying that 10210 just does not work. I ported my Telkom number across to Vox Telecom VoIP (via DSL Telecom), and have been trying without any luck at all (yet again) to formally cancel my Telkom account - they will not permit DSL's fantastically helpful call centre to do it on my behalf !! Problem is that when I call 10210 and wait 30 mins, I am no longer free calling from the number with the problem.... so I am being charged to sit and wait for the very inefficient service that I wish to cancel. Surely when ADSL was cancelled some weeks ago, and now my number is ported away from Telkom, and they even send me a sms \Dear Customer