Poor Fibre Service

I have a new fibre line, for the 2nd week in a row, connected but no internet. I have been on numerous calls with technical support, configuring and troubleshooting the router. I have even tried using an older router, and still no internet connection, username and password, recreated, connected and then error= "Authentication failed".

I am now paying for a service which is nonexistent. Turnaround times 24-48 hours, weeks are now elapsed. HELP! Regards, Pranalen