Unable to get ADSL due to 15 year incorrect arrear

This query is on behalf of my Dad, since he keeps getting pushed around in circles by Telkom's bricks and mortars. <br> <br> He had account with you 15 years ago in the Durban area. Once he decided he was moving he subsequently cancelled. Unknown to him, Telkom did not cancel immediately and billed him incorrectly. Fast forward to 2015 when he needs an ADSL line. Telkom now refuses to accept his application pending the settlement of this amount which by law should not exist / be cleared. <br> <br> All he requires now is have the ADSL connection, since he needs it for work and study. He is therefore willing to accept this incorrect debt and pay for it on presentation of an invoice and have his account cleared, alternatively Telkom may in all intelligence clear this ridiculous debt and obtain a new contract customer who is willing to stick with them for a minimum of a 2 year contract.<br> <br> This has become extremely, needlessly frustrating and I hope it can be attended to as soon as possible, as we have been to store after store with little help.