"Unlimited" BT Broadband - Download speeds locked ...

Question

Since February 16th something has been choking my broadband connection literally pretty much to death. 15kbps download speed doesn't constitute broadband. That is, nevertheless, pretty much all we've been getting.
ADSL Line Status Connection Information
Line state:    Connected
Connection time:    0 days, 03:54:48
Downstream:    2.5 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):    7.5 dB / 17.0 dB
Line attenuation (Down/Up):    57.6 dB / 31.5 dB
Output power (Down/Up):    18.2 dBm / 12.3 dBm
FEC Events (Down/Up):    123805 / 0
CRC Events (Down/Up):    37 / 1
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):    258 / 0
Error Seconds (Local/Remote):    23 / 3
Already had an engineer round, called for a reset - seemed to fix the problem for a few days - that held almost good for 8 whole days however, come peak - broad band would throttle down. Now its back to what it was, throttled to 15kbps. Doesn't mater what you try to download or where you download it from - p2p or http - makes no difference.
Current maximum just about makes 15kbps.
How do I get this fixed, please? Getting pretty **bleep** PO'd.

Answer 1

... I've been connected to the **bleep** test socket since February, John. The engineer even fitted us with a brand spanky new socket, just to eliminate any possibility of bad copper.
Now peak is over, indeed. Yes. Download speeds are higher. Currently notching up 167kbps! Three minutes ago I crossed the Heisenberg Threashold, ended up in 1947 and shot my own Grandfather....
Never time travel with a loaded gun, John. It's bound to end in shinanikins.
But. On a serious note. We're supposed to be getting between 1-2mbps on this thing, John. Now we're on unlimited. That's what we're supposed to be getting. Highest it has yet gone is 300kbps. That's the best it does.
We don't switch off the hub. I've had it running constantly. **bleep** thing keeps dropping its connection. Doesn't do it when speeds are up. buy when they're crawling - and by this I mean litterally struggling to make it up to 15kbps - the poor thing probably feels like its had it's throat cut.
PS: Thank you for the info. We use adsl filtered NTE5 faceplate. Enginner checked the line March 6th. Lines fine - he found the problem came down to the SNR being set to 15db Interleaved when (for our distance from the exhange box) really we should be set to 9 db Interleaved. Called for a remote reset - immediate pick up. This held fine for about 8 days but, as the days went by - speeds started dropping as peak kicked in - now we're in the possition we are.
The question is how do we get this fixed.
Pretty sure the problem is with the Automated Traffic Nazi at the exchange. When it throttles back the line - the Hub 3 drops the connection. When the Hub 3 drops the connection....