Telkom is the worst, in every way!!

I need to cancel a line. You can only do it online. I registered on your website. Took me 19 times to register before i got a pin. Now i need to load my account and your website says "We could not identify you as a valid contact for this service on this account". I needto cancel this account. I called endlessly and there is never answer at your call centre. Been holding for over 15 minutes for more than 20 times. So how do i cancel this service. I dont have a contract with telkom but the telkom store still say if i cancel my debit order i will be blacklisted.