Vodacom Insurance - Contact Centre Issues

I need to update my details for my Vodacom Screen Insurance. Their call centre agents simply do not answer the calls. After 10 minutes of music without any indication that the phone is even ringing, I had to hang up. Then I tried to email them on ********** (which is the email address on the website, as well as was supp**** to me on the Vodacom chat) but the email bounces back as undeliverable. If it is this hard to contact them to update my details, what should I expect when I actually want to claim? I have now found a second email address: ********** - let's see if they respond. I think I should just cancel this insurance.