Being billed for an account that should have been closed.

I wanted to apply for a new service on my Telkom mobile account and the agent at the Telkom mobile store told me that I owe money on an old account/number. I would like to know if you can pick up if I have any outstanding amounts owing. The number: ********** 905 which should have been closed and settled a long time ago Well being Telkom they will find a way for me to pay that amount anyway so if I could please get the banking details of Telkom mobile so I can pay this account for the 2 second time.