Wrongful billing by Telkom!

My data contract with Telkom expired and I went to sign up for a new one in December 2020. They charged me for both contracts in January and February. I called their customer service and the consultant referred me back to the branch where I had taken the new contract. I then ask for an email address to which I can escalate my query and he said there is none. After to-ing and froing with him I decided to cancel all these contracts but it turns out they'll charge me a R1500 penalty fee - that's the last money they'll get from. Clearly, Telkom doesn't care about their customers.