Incorrect billing after cancellation of contract

2yr contract with Telkommobile expired and I requested to cancel on 15/9. It took Telkom nearly 2 months to cancel this contract after my initial cancellation. Now there is still a major problem with my bill. I was billed over R750 for November and my usual monthly bill was only R307. I did not even use any data on the contract since end October. Ansley from The Bridge said the matter is being attended to. Nicholas, a general manager also gave me a reference nr on the 13th of November but the matter is still not sorted out.<br>