Sudden speed drop after BT help

We had a noise on our phone line so after doing a quiet line test at the master socket I reported it to Tesco who bill us for our landline voice service who phoned me back and said BT could see the issue and would get it fixed. At the time our broadband connection speeds were around 1726 kbps or so.

After about ten days the noise stopped and our broadband bounced up to 2144 kbps. Unfortunately that was short lived and the noise is now back but to a lesser extent than originally. The worst thing is our broadband cannot seem to connect above 1056 kbps.

I've phones Tesco again and they say the line is clear although when I do a quiet line test I can still hear it. I would dearly love to get the 2144 kbps back but I have no idea what BT could have done to have just a temporary fix.

Our broadband is provided by Demon who have been a complete waste of space as far as getting any kind of support from in the past. The router is a Netgear DG834Gv4 and was previously more than happy to sit with a 6.3 db downstream noise margin but now can't seem to do better than a 13.4 db margin.

Before I push the matter with Tesco any suggestions as to what might have happened and how I can persuade them to get it sorted?

Edited by deleted (Thu 08-Dec-11 14:33:53)

Don't bother with Tesco, the issue you are trying to report is now a broadband one, so have Demon get on to it.

I would rather like the clear line for voice calls also.

Do you get a clear line for voice with router disconnected? If so, it's solely a BB issue.

No! As I said when I do a clear line test at the master socket I can still hear noise.

Sounds (sic) like you need to report that to your phone provider!

There are often problems when your phone (voice) is directly with BT - things only get harder when using a 3rd party

Have had one voice fault when using WLR and was just as easy to handle as calling BT, so I'd suggest it varies a lot.

Key thing is only report the noise if the quiet line test is showing it up WHEN all the ADSL hardware (including filters) is unplugged and disconnected.

Also as per the phone book, verify this issue from the master socket test socket, to rule out internal wiring

Yep, verified the noise with the front of the master socket removed and just a phone plugged in. Noise is consistent but can't work out why it disappeared and then came back again.

Noise is consistent but can't work out why it disappeared and then came back again.

Because that's what happens with intermittent faults. The noise on the line is the most apparent of symptoms, but isn't always there.

It's been there for between two to three years except for two to three days the other day.