Using an authorised bank account and charging me none payment fees

In June, I canceled the fibre account and opened the new account (***) B***. I gave the bank account number that Telkom has been debiting ever since. Now I am told I owe them R1200. 00 of which R647. 89 is apparently the initiation fee and R202 over 3 months since the payment did not go through. They are debiting a different bank account that I did not authorize them to debit and make me to pay none payment fee of R202. I called in and explained to their agent who understood but still say Telkom will not open my line because of the amount. Though I don't know what I am paying for, I said to the agent, I can pay R647.89 and dispute it later but I will not pay for their mistake of going into a bank account that I did not authorize them to debit and get charged for none payments when it is their internal mistake, probably from their sales department when the new account was been opened.