Slow Broadband. BT does not seem to want to fix an...

Question

In late June, I moved house within Cambridge and decided to stay with BT. The advisor told me that I should get a speed of around 4MB. I also checked with the BT, Sky and Virgin web sites and they all stated that I should get a good fast service. Sky suggested that I would get between 7MB and 14MB. Despite this, I have never had a speed higher than 700k and the connection keeps dropping out. I am sure that there is an issue as my neighbours all enjoy good connections in the 5Mb – 10Mb range.
Over the last 10 weeks I have made numerous calls to the help desk to try to get the problem resolved. Each time I call they run through the same set of questions and line tests with me. I have often been told that I would be called back but nobody ever does. 
On the August 5th, an engineer came out to see me and, after carrying out a lot of tests on the line, he changed the master socket to one that includes the micro filter and replaced my BT Home hub with the latest model. He told me that he would reset the profile and that this would help the problem. He also told me that broadband would be an issue in my property as the wires to the exchange were too thin. There was no improvement in the service.
I complained again using the web form on the BT website and on August 22nd I was called back by someone who I could not understand due to her strong Indian accent. Eventually, I got transferred to her supervisor and was then put through to a more technical support team. After testing the line again, a second appointment was made for an engineer to come to the house.
The engineer came on August 24th and after another series of tests told me that the connection from the house to the wiring box in the street was fine as was the connection to the exchange. He agreed that the speed that I am getting was exceptionally low and should be much faster and at least as fast as the 4MB that I was told I would get when I signed up for the service. He then told me that the most likely reason for the problem was due to the equipment in the exchange being faulty.  He told me that he would report that to BT Wholesale and that they would address the issue.
Seeing not improvement in the service, I called the help desk again on August 31st and they started to take me through all the same questions again. When I asked them if they could see the history of my fault, they told me that my case had been closed on the 24th August as the fault had been successfully fixed!
I have added my ADSL status below. The router claims 57dB downstream attenuation – which is high – but the BT engineer measured 45dB to the DSLAM.  The router normally loses the connection about once a day, which is why it only shows connection for just over 10 hours. I usually use speedtest.net as the BT speed checker often times out on me and will not complete the test. Last night, I got it to run and it gave me 657kB download.
I am at a loss how to resolve this. I worked in technical and customer facing roles in the telecoms industry for 25 years. It seems to me that BT has failed to provide any kind of customer support as well as handing out quite dodgy technical information (thin wires). It is especially vexing that they have closed the complaint without fixing the problem. Anybody have any idea what I should do next?
Connection Information
Line state:      Connected
Connection time:       0 days, 10:50:34
Downstream: 1.063 Mbps
Upstream:      448 Kbps
ADSL Settings
VPI/VCI:         0/38
Type:  PPPoA
Modulation:   G.992.1 Annex A
Latency type: Interleaved
Noise margin (Down/Up):   8.0 dB / 16.0 dB
Line attenuation (Down/Up):         58.1 dB / 31.5 dB
Output power (Down/Up): 18.6 dBm / 12.4 dBm
FEC Events (Down/Up):      561 / 8
CRC Events (Down/Up):      0 / 6
Loss of Framing (Local/Remote):    0 / 0
Loss of Signal (Local/Remote):        0 / 0
Loss of Power (Local/Remote):       0 / 0
HEC Events (Down/Up):      0 / 3
Error Seconds (Local/Remote):       7 / 48
Solved!
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Answer 1

Hi John
Thanks for the quick answer. I tried the quiet line test and there was no noise on the line. I also re-ran the BT speed checker and got the results below. Since the actual speed is within the profile I have had a lot of frustrating calls with BT where they have just told me that there is no problem. Incidently, BT changes the main socket to one with built in micro filters. The router is connected directly to that. I also ran it for a week connected directly to the test socket via a filter and with no phone connected - with no improvement.
Many thanks and regards
Sam
1. Best Effort Test: -provides background information.
    Download  Speed
    648 Kbps
0 Kbps    1000 Kbps
Max Achievable Speed
 Download speed achieved during the test was - 648 Kbps
 For your connection, the acceptable range of speeds is 400-1000 Kbps.
 Additional Information:
 Your DSL Connection Rate :1088 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
 IP Profile for your line is - 750 Kbps
2. Upstream Test: -provides background information.
    Upload Speed
    345 Kbps
0 Kbps    448 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 345 Kbps
 Additional Information:
 Upstream Rate IP profile on your line is - 448 Kbps