IP Profile stuck at 135kbps for 1 month

Question

Hi all,
I have had numerous problems with  my broadband for over a month now, after years of stability and happy surfing...and after the last two weeks of just going round the same loop with the phone help, I am trying this forum for the first time. Please help!
Please excuse the long first mail introducing the problem history:
About a month ago, my BB started dropping, and synch rate fell to 2Mbps (previously 8). If I knew then what I know now, I might never have done anything about it! Since then, the sequence of events is:
1. New home hub delivered (previously HH 1.0, now 2.0 type A). No change.
2. Couple of days later I'm told an engineer has "tweaked" something in the exchange, and everything seemingly returns to normal - 8126kbps synch rate, IP profile 7000, happy customer.
But...
3. Two days later, IP profile goes to 135kbps, still synching at 8126kbps. I was about to go on holiday, so I left it, thinking potential interim fault.
4. Back from holiday 11 days ago, no change, so ring again. I can see that BB has been disconnecting frequently while I was away, so clearly some problem with the line somewhere. An engineer comes, and rewires my master socket, which my router is plugged into directly (it was old style, now brand new NTE5 faceplate). Since engineer visit, BB line stable - hasn't dropped at all except deliberately when BT doing investigations, etc.
5. BT tell me the IP profile they have set is 7000k, but Speedtester says otherwise - this mornings results, same as any other stage over the last 4 weeks:
Download speedachieved during the test was - 52 Kbps
 For your connection, the acceptable range of speedsis 50-250 Kbps.
 Additional Information:
 Your DSL Connection Rate :8126 Kbps(DOWN-STREAM), 440 Kbps(UP-STREAM)
 IP Profile for your line is - 135 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 9.22:27.5:63.28 (SBE:NBEBE)
6. BT send another engineer, who says that the line is fully functional, but that as far as his diagnostics are concerned, I am on a line that has a maximum connection speed of 8Mbps, when I am paying for "up to" 20Mbps. He says, according to his test, I should be able to get 17Mbps (although I suspect this is optimistic - BT say I should be able to get 7-9 Mbps). Anyway, the engineer says that it is a BT retail issue, there is no fault on the line, and that he suspects that if they set me up correctly on the 20Mbps service, the 135kbps problem will go away.
7. Since then, 6 days ago, BB line has remained stable, synching at 8126Kbps, BT have tried "placing orders" to do what the engineer suggested (though they maintain I am on the correct service). These were delivered late or not at all, and I suspect were just stalling tactics. BT say my IP profile is still 7000Kbps, while Speedtester continues to say otherwise. I have started losing my mind...the case continues.
I am kind of at the end of the road - if there is nothing wrong with the line, and the connection is stable, why hasn't the IP profile settled down?
Equally, if there is no problem on the line, why is my noise margin so high (see stats below). There are no other wires going in to my master socket, other than the phone and the router. I have no extensions. I have tried 10 different filters (though when I have previously had a faulty filter, the symptoms were very different). I am at a loss.
BT's last effort at this was last night, still no change. Router stats:
Line state
Connected
Connection time
0 days, 8:57:53
Downstream
8,126 Kbps
Upstream
440 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.5
Latency type
Interleaved
Noise margin (Down/Up)
19.3 dB / 29.1 dB
Line attenuation (Down/Up)
24.5 dB / 12.5 dB
Output power (Down/Up)
0.0 dBm / 12.6 dBm
Right now, I will take any advice anyone has. It has to be better than going round and round with the same questions, and no change via the phone.
Thank you in advance!

Answer 1

Finally, the issue was resolved on Monday....my IP Profile was set back to 7000k, and the line continues to be stable.Then on Thursday, synch speed went up to 16000k, so very happy with that - it was almost worth a month of 135kbps to get the line uncapped.
BT's database still tells me I can only get 7Mb on my phone line! Although post code check suggests 13 Mb...I wonder how much other misinformation there is out there.
Anyway, I am still waiting for the IP Profile to adjust up towards the new synch speed (slightly concerned that it is stuck, as no movement up from 7000k in 26 hours).
Thanks to the moderators for monitoring this case, and keeping me updated. I'll wait until I have seen the IP profile auto-adjusting up towards my new synch speed before I mark the thread as solved.