post stats from hub advanced settings then technical log information
enter phone number and post results https://www.btwholesale.com/includes/adsl/main.html
If there is noise on the line, then you need to report it as a noisy line. Do not mention the broadband problem, otherwise it will end up in the wrong fault queue, and take much longer to be fixed. There are plenty of people who can fix phone faults, but not as many broadband people.
Once the phone fault is fixed, then the broadband will get better.
Its important to make sure that the noise is still there, when you are connected to the test socket, like this. This is to prove that the fault is external to your property.