Worst service

Two calls and two emails sent to different team leaders, yet I have not received any response and it has been nearly two weeks. Telkom has completely messed up my invoice. My contract has ended and they have moved me to month-to-month however the amount I have agreed to pay upon taking out this contract has increased with an extra R352. When asked why this has happened, I am being told that this is an "add-on" . Yet, when I agreed to the contract, the "add-on" wasn't sold as such instead it was part of contract and the monthly payment. It's so disturbing that there is no clear process and communication between call centre staff and sale reps. Now when you as the customer is being told one thing upon sale and another thing when encountering an error and then querying it, you are then being told something completely different then telkom end up holding the customer accountable for their poor communication and processes within their company.