Very bad crackling on the landline

[Lynnec]

I need something done with the crackling on my land line 

[Mark39]

Welcome to the Community @Lynnec 🙂

Just so you know, while you may see a reply from Sky, we're mainly customers here.

First can you try the simple connection test here, even if your broadband service is working ok.

Let us know the result.

https://www.sky.com/help/articles/broadband-diagnostic-start