Cancellation

I am trying to cancel a contract with Telkom since September 2017. I have send many emails, made calls, spoke to a lady (Cele Zulu) and yet, still no confirmation of the cancellation. The email contained the cancellation form and my ID as requested on there webpage for cancellation. Last week I have send out a letter to ********** (as indicated on Telkom's webpage) and ********** to inform them that I will cancel my debit order if I do not get reply within 24 hours. Still nothing. I cancelled the debit order now and kept all the proof that I tried to cancel the contract.