Worst ISP Ever

I don't have WhatsApp, and unfortunately I placed an order with Webafrica, on their website, but, when they then emailed me to inform me I hadn't paid the delivery fee - which I had - I rep**** to the email with proof of payment. The email bounced back saying 'this is an unmanned mailbox', so I tried to phone, and was either referred to the WhatsApp number or sent back to 'options', ad nauseum. So I tried the 'live chat' online help, but that doesn't work. So I have no way of contacting these people, and now they have apparently discovered my payment and 'activated' my fibre line, so the new order I placed with another ISP is now blocked and I can't contact Webafrica to cancel the order! They emailed to say my router will be delivered soon, so I hope to relay a message to them via the delivery chap. The whole thing is farcical! How can they only have ONE method of communication? I haven't even used their service and I'm already fed up with them. I can't use their service, even if I wanted to, which I definitely don't, anymore.