Help us improve our process for when you experience home Wi-Fi issuesx
We have put together a short survey to capture your feedback in terms of what BT can do when you experience home Wi-Fi issues. We would appreciate it if you could take a couple of minutes to complete a short survey. Read more from here, Fix my home Wi-Fi
Have you had a chance to try the test socket as suggested @imjolly and @Keith_Beddoe? If there was still noise on the line that would indicate that there is a fault on the network and an engineer would likely be needed.
If you need any help in arranging and engineer, please post back as I'd be more than happy to help.