High Sync low throughput - ongoing issue

Hello all - any ideas help gratefully recieved.
Since 17th November I've had speed problems on my ADSL connection. Started with drop in speed which I reported as a fault. I received a fault number, spoke to customer support colleagues in India who could not resolve it. All the usual - test socket, filter change, reset stuff. It was escalated even though I noticed that the fault was reported to be resolved on my BT profile.
My IP profile was reset and I was sent a new hub. Initially, the IP reset seemed to work - the hub made no difference. A few days later it happened again. So, I should have download speed of around 8mbps but I get 1mbps. I live opposite the exchange.
I raised it again. Given a new fault number around the 3rd December. A week of calls every few days to and from India - they could see what I could see - high sync rate low throughput. Line says the right speed, IP profile says the right speed but throughput stuck at 1mbps. Fault was escalated and I also raised it with the complaints team.
On the 10th Dec an engineer came to the exchange (across the road) I was called to say it was all fixed. It wasn't. On the 12th Dec an engineer came to the house. No problem found. PQ Test, Eclipse Test, APTS Test, BTAS Test, Ping Test - all passed. Cabling in the house fine. Changed wires, hubs etc - no change. He was convinced it is the exchange but he could not fix it.
Now dealing with helpful BT compliants handlers. They are helpful in terms of the contact bit there is still no resolution or detail or even a sense that anyone knows what the problem is. Since Thursday 12th I have been told every few days that BT wholesale are 'invesitgating' and 'testing' and that I should wait 48 hours. Most recently yesterday.
This has been going on too long - communication with BT is OK but they just can't fix it. Any ideas gratefully received.
Merry Christmas and kindest regards
Richie

Connection Information
Line state: Connected
Connection time: 4 days, 04:47:16
Downstream: 7.938 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): 15.6 dB / 25.0 dB
Line attenuation (Down/Up): 0.4 dB / 0.5 dB
Output power (Down/Up): 7.9 dBm / 12.1 dBm
FEC Events (Down/Up): 29171 / 0
CRC Events (Down/Up): 31 / 0
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): 47 / 0
Error Seconds (Local/Remote): 1048 / 5

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Connection information
Line state
Connected
Connection time
3 days, 0:25:12
Downstream
8,867 Kbps
Upstream
888 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.5
Latency type
Interleaved
Noise margin (Down/Up)
13.8 dB / 10.0 dB
Line attenuation (Down/Up)
33.5 dB / 16.2 dB
Output power (Down/Up)
0.0 dBm / 7.1 dBm
Loss of Framing (Local)
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Loss of Signal (Local)
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Loss of Power (Local)
0
FEC Errors (Down/Up)
713261 / 4294967169
CRC Errors (Down/Up)
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HEC Errors (Down/Up)
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Solved!
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