Worst ISP In South Africa

I have been battling with SADV to assist with poor Internet. It's been months now since early December and their automated systems on WhatsApp and Facebook messenger are so useless, after one or two prompts, you get no more response. I am paying for a service that is far from OK, let alone acceptable. The router keeps losing Internet every 5 minutes. They can't even send technicians to come and assist.