Webafrica non-existent support and unusable VOIP

I registered for a VOIP telephone line with Webafrica. I immediately opened a support ticket with some questions. It took them 22 days to respond to my ticket, they did not answer any of my questions just asked whether I still had the questions. I opened another ticket. They claim 48 hour response time. It's been 48 hours, no response. My complaints in that ticket: I can't use the VOIP handset due to non-stop incoming calls from a number 100. There is no volume controls on the phone and people complain the call is soft. If I use the mobile app it gets all calls and the landline phone never rings. I would like to return everything and get my money back, but since you can't call them and there is no response to support tickets I'm not sure how that's going to be possible.