No internet since the installation

My fiber installation was done last week Thursday. Router was delivered Saturday. I still don't have any internet. Logged a call on the Zoom portal on Monday. Phoned them on Tuesday and got told I need to speak to the ISP. The ISP informed me that they will log a call as well. I phoned again today, no call was logged. I got told they need to speak to the installation team. Can't give me any feedback. This is the worst service.