Disgruntled customer

I took a contract with Telkom and the agent that assisted me told me I can cancel the contract at any given time .upon hearing that I agree because I was not sure of the service delivery . About a year n I was offered another Sim contract which i did agree upon . the contract was 15 months old when I decided to cancel . I went to the Telkom store at the Phoenix plaza n canceled my contract .The sales assistance at the store didn't advice me about still having to pay for the contract although it was canceled. NOW which idiot wil pay for something they are not using Had I know I would have just carry on with the contract n enjoyed the benefits instead of paying for something that's of no benefit to me . I called the Telkom call centre on numerous occasions with no joy . I then engaged my lawyers from scorpion .They contacted Telkom n we came to an suggestion that I need to pay Telkom in 3 installments .To my disappointment Telkom deducted monies out of my account without authorization.

I called the call centre so many times .logged compliant via their complaints department n the issues has not been resolved as yet .

How do I resolve this issue ?