Telkom billing is more than agreed upon

I am very dissatisfied with Telkom. I can never get through to query my account. The app does not have a proper contact or email address either. For the second time this year my account is R200 more than what I app**** for. I was ensured that my uncapped line installment will remain as is and if my using exceeded the recommended 999GB that the line would be throttled so why is my bill so high? The first time I left it as it was quarantine and nownits happening again? Can I please get information as to why this is happening?