Still been billed 6 months later and no credit

Still been billed by Telkom after spending long hours on the phone and in their stores trying to resolve a cancellation for two adsl lines one of which was never installed but yet I'm still been billed for it 6 months down the line. Calling your support/chat, going in store, emailing, cancelling online NOTHING WORKS!!!!!! I want to be credited for as well for my adsl service that you'll disconnected initially without my request but kept on billing me.

Still I'm wasting my time writing to you'll these ongoing messages and it just goes on and on.

So frustrating, Can't believe how you treat your customers!