Supplier won’t cancel my subscription

I’m so frustrated I feel like I can pull my hair out. I cancelled my Telkom subscription in July before moving to Australia. No I keep receiving bills every month. It’s impossible to contact them because they have no contact email address and I can’t call 1021 from Australia. When I click HELP on their web page I get a 404 ERROR. While I was still in SA I had to call 3 times to cancel my account. This is ridiculous.