Failure to cancel contract

I have completed the cancellation form for one of my Telkom mobile contracts. I have given more than one month notice. The contract was not cancelled apparently because they could not get hold of me. <br> I contacted the call centre and I specifically instructed the agent to email me. The agent said the accounts department would email me. Another month passed and still no cancellation. I contacted the call centre yet again and no-one knows what i am talking about.<br> Why do they need to contact me and why do they give up so quickly. Many people have jobs where they cannot answer the phone during the day.<br> Please cancel the contract according to the form i completed.