My account show arrears although I did pay

Telkom double charged my account during the August Bill. I lodged a complaint and they said they will look into it and resolve. Now 6 weeks later they are charging me interest on the arrears and the person on the call centre tells me they can switch my phone off. My telephone service number is ***. I am Jan Daniel Steyn. It is a battle to get Telkom to respond as they are not willing and able to assist. My telkom account is well handled and always paid. I am extremely frustrated by this conduct of Telkom.