Telkom and Incorrect Billing

I have an inexplicable bill from Telkom that keeps rising exponentially with ridiculous interest rates.

I have tried to get someone to show me my contract and what I had initially agreed on. I have also asked for evidence indicating when I asked for the so-called uncapped data usage but with no assistance.

Now they are threatening to list my name but no-one has provided me with requested proof. I am also being charged for paying my instalment 5 days earlier, instead of 10 days earlier. The charge is R200? That is half of my instalment.

I need an explanation before I can be made to pay that ridiculous amount that they say I owe.