Cannot contact Vodacom

I wish to cancel my Vodacom FTTH service. I went onto your website to get the email address to use to cancel, but there are no email addresses provided. Instead I'm taken to a page called TOBI which is apparently a chatbot, and which doesn't work.

Since you make it impossible to contact you, I'll use this public site to cancel my service, with effect from the end of October 2019. My account number is provided below, and your debit order mandate is hereby cancelled.

I'm hearing impaired, so DO NOT TELEPHONE ME! Communicate by email.