Cancellation of Contract

I requested to cancel my Telkom mobile contract at the Telkom branch in writing December last year, I received ***. I assumed all was in order and received my last statement for Jan 2016 which was the end of my 24 month contract. I then received a message on my cell that Telkom is trying to call me in Feb and when I tried calling back was advised that the cancellation department was trying to call me and could not get hold of me, I explained that I cannot answer my phone at work and I wanted this contact cancelled. This was not done and remained open I then received a bill for February which was debited of my bank account for an amount over R700 nearly twice the amount of my original debit. I called to the call centre more then 3 times we no joy and when I asked to speak to a supervisor no one was available. I kept been promised this will be resolved but no feedback for over 2 weeks. I would love to get a direct contact number to someone superior to call or them to email me on [Email Removed]