No feedback regarding cancellation

I have moved abroad recently and therefore need to cancel my Telkom mobile contract. I have requested from Telkom the correct contact information regarding cancelations and they provided the [Email Removed] email. However, I have sent an email with my cancellation form to them on 8 January and have subsequently followed u on the 12th, 19th and today. I have not received any feedback or even a confirmation that they have received any of my requests. This is worrying as I have heard of many cases where they have failed to cancel contracts.