Poor service from Supersonic internet provider.

I moved to a new address and subscribed to Supersonic as my internet service provider. After waiting for more than one week, the technician arrived with the fiber box and router. He plugged in the fibrebox and connected the router and left. It is more than one day and the internet is not working. Support is via WhatsApp and non-existent. This is the worst ISP I have ever come across. My advice is - avoid Supersonic or if you are up to a technical challenge proceed with Supersonic