Unbeievably poor service

I have been trying since January to cancel my mobile WIFI contract with Telkom. The contract is finished and I no longer have use for it. I have been to a Telkom shop where they told me they dont do this in store; it needs to be via email. I have emailed the form 6 times since January the last being on 07 May to an individual who gave me her address via the help chat line. To date I am unable to find out if she has cancelled the contract or not as she just fails to reply to my mails. I have tried again today to use the chatline and simply get zero response.