*********** Telkom accounts department and overcharging

After months of being overcharged for a ADSL service I no longer use after fibre was installed and nobody can help me and Telkom keeps charging me for for both fibre and ADSL. I have called over 20 times to sort this out and somehow the *********** staff at Telkom can not credit me for the R800.00 on ADSL they are overcharging me monthly. Then I get threatened that my account will be cut off. Pathetic customer service.