Impossible task of cancelling contract from outside South Africa

Been looking for a way to cancel my contract for hours. Go to the Live Chat, doesn't work, even though it shows no mention of it not working until you try to start the chat. Follow the links for an email from your website, regarding cancellation requests, only to be greeted with a message that says that emails are not longer handled, phone in.

How do you expect customers who are not in South Africa to do this? I'm sitting in New Zealand and it is going to cost me a fortune to phone you. Please provide me with an electronic method of cancelling my contract. It is 2018 after all.