So the professionals are coming up blank - Noise a...

Question

Here goes.
My 1st 3 months with BT were beautifull - I was getting almost 2.0MB and life was good.
Then something went wrong and it took 2 months of sub 1mbit service to fix but it was fixed and compensation was rewarded.
11months of 14-16mbit service ensued and life was good. THe FUP limit was even raised to 300gb so now I never even get close to the limit, even with skyplayer and stuff on the go.
2 months ago things started going wrong again, I gave the Mods a shout and they reset my noise profile which I duly kept an eye on and I saw it hovering between 4.2 and 4.8 db! That gave me throughput of 17500kbits!!!
Then maybe a month ago now maybe three weeks my noise has jumped to 9db and my throughput is at 12000kbits
Two engineer visits confirm my throughput numbers.
THe latest engineer visit yesterday said everything is fine and its just the high noise on my line causing the problem. So another profile rest has been requested.
My throughput has been cut by almost a third for some reason.
Has anyone here experienced anything similar? I'd really like to know why this is happening.
I signed up for a 3rd year with BT because I knew the rate I was getting was really good for adsl and then a few weeks after renewing this happens. I think a 30% drop in service that has been stable for over a year could be reason enough get out of my contract with BT because if I'm not getting the uber rate I'd like to be with a  different ISP. (one that doesn't throttle and traffic shape)

Answer 1

Its been like that for over a year, on off on off. My connection rate stayed pretty much the same, never noticably slowing down. I'd see that my router was only online for hours rather than days and think "oh well" as it didn't effect my BB experience.
Onetime it got stuck in a loop for an evening which appeared to confuse my HUB to the point of needing it replaced. After that my latest issue happened... I think I logged the date on here somewhere.
When I say reset, I get flahsing orange BB and Phone lights but the other 2 lights stay blue.
I have spent time looking at the last few digits of the throughput and that does vary a bit, 100kbits either way.
Upload was stable at 1276kbits for a while (3 weeks or so) along with 17500kbits throughput
Now its 1156 ish with 12467kbits thoughput.
Without anything else to go on it appears the traffic shaping/ exchange algorithms have been tweaked or something. A signal tollerance has been reduced? I dunno its the dark art of that DSLAM thingy or what have you.
(the sceptic in me thinks they are shaving bandwidth off ADSL customers to feed vision & infinity but that is unfounded and most probably worng)
I'm annoyed that i signed up thinking my connection would offer me the same service it has been givving for over a year and the week I sign up for another 12months it slows down. Probably coincidence as an office block has just had new tennants so that could be increasing chatter on the wire form the exchange which could be a contributing factor as well. So could sun spots. Or some secreat theoretical high energy research lab has been built under my cabinet.
I just want either my old service back, and explanation of what has happened to my connection and why or a free contract cancellation. I can get this speed from a different ISP for less money, if I get my old speed back then BT are offering value for money.
As I still have functioning BB I am remaining calm, but cheated