STILL BEING BILLED FOR A CANCELLED CONTRACT

We went in to the Telkom shop to cancel our contract, the lady sent us away and said we can only cancel our contract on 25 August. We then came back at the end of August and filled in paper work to cancel the contract. They said it will be cancelled.. Now they have billed us for September, October and now November and we dont have internet!! It should have been cancelled already by the company. We have called customer care twice and STILL the problem has not been resolved. And we are still waiting for the mail and call we were told we would receive from Telkom.