Fibre issues

[Alice3]

Since upgrading to fibre my connection has been shocking. It keeps going on and off, my speeds are way below what was promised and my phone basically never has Internet if connected so running on mobile data.

[aac74]

What does the checker say:

https://www.sky.com/servicechecker

https://www.sky.com/servicechecker/broadband

https://www.sky.com/servicechecker/broadband/checks

https://www.sky.com/servicechecker/wifi/checks