Hi @Davlowe,
Welcome back to our Community Forums! Thank you for your post and I'm very sorry to hear that you're experiencing an ongoing issue with your landline! I can understand how frustrating this can be.
Can you tell us if you've been able to take a look at our Landline Faults page to see if this can help identify and resolve your issue?
Are you hearing the crackling noise only when on calls, or anytime you pick up the phone?
Let us know so we can help.
Thank you.