Cancelling my Telkom mobile account. Does Telkom know what good customer service is?

I cancelled my Telkom mobile account 18 months ago before I left the country. They have since been running down the credit. I have been receiving monthly invoices hence my nervousness. Being out of the country I had my Father follow up on the account and lo and behold the branch said they had no other way of dealing with cancellations. The system runs down the credit balance, which I had to pay, to close the account and then it will be cancelled. And then surprise, surprise. 18 months later and the debit order has kicked in again. I have contacted Telkom from Australia and they are asking me to reprocess my cancellation. My frustration is immeasurable and then I have to remind myself that I am dealing with Telkom and I cannot honestly say that I am surprised this has happened. Thank-you Telkom for your great, customer service