Awful broadband for 3-4 months with no resolution ...

Question

Starting roughly 4 months ago our connection began acting terribly during peak hours and ever since we've had an extremely unstable connection and nothing has been done to fix it. Starting daily at anywhere from 12PM to 6PM, our connection will drop from a throughput of 6mbps to something in the region of 100kbps to 800kbps. With a family of five, all of whom utilise the Internet for school, work and leisure, we struggle to have one person able to use the Internet at all.
Over the past few months I've spent a considerable amount of money attempting to fix or rectify anything that might be wrong at our end; we've purchased new routers (currently sitting on a Draytek Vigor2700 but also have one of the newer Linksys models sat in it's box) and completely replaced all cables and filters our side of the faceplate. We've been connected directly into the master socket for the duration and daren't connect any telephones at all for fear it will ruin the little Internet we do receive. I've tried running the connection on a variety of different computers, reformatted computers, and run tests directly from the routers - all with the same result. All in all, we've tried everything possible that we can and it is severely affecting the use of our telephone service as well as our broadband usage. Our exchange is Caxton and is constantly listed as green on the exchange tool at Plusnet.
I've spent a lot of time back and forth with my ISP trying to get a fix for this, often leading to days bordering weeks waiting for responses and/or actions to be taken. The majority of the time we're told that there's nothing wrong with our line and that it's escalated to the "next level", this appears to be a viscous circle. We were at one point told that we were on a suspected hot VP and had to wait 10 days for this to be confirmed with tests and then a further 2-3 days to be switched - needless to say, this did nothing to the issues we are experiencing and if anything, we now have a worse connection.
Since then we have migrated to a different ISP in the hope that this would help any issues we were having (we specifically opted for Plusnet who have their peak priority service), I was also growing tired of the consistently unhelpful responses from our previous ISP, Entanet - constantly being told to ring back in a few hours/days for more information with little to no progress on anything.
We feel pretty helpless at the moment, there's clearly nothing we can do to fix the issues we're having and we aren't having any luck with the attempts we've made with our ISP or BT so far. The only break we seem to have had was in contacting Ian Livingstone whom forwarded our concerns onto our ISP. Although the latest response that I've had from this is that work will be done on our exchange in 3 months time, June 24th. Needless to say I'm extremely disappointed that all of this has gone on for so long with nothing having been done and a fix in 3 months time is completely unacceptable.
I've included some recent speed tests below, these were completed yesterday and today (with identical sub 300 results in the days prior to these).
Download speedachieved during the test was - 227 Kbps
 For your connection, the acceptable range of speeds is 600-7150 Kbps.
 Additional Information:
 Your DSL Connection Rate :8032 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
 IP Profile for your line is - 7000 Kbps
Download speedachieved during the test was - 637 Kbps
 For your connection, the acceptable range of speeds is 600-7150 Kbps.
 Additional Information:
 Your DSL Connection Rate :8032 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
 IP Profile for your line is - 7000 Kbps
TL;DR
Peak time and overall throughput is awful and no one appears to know why. It's an ongoing issue and all support tickets we open are escalated over and over to no avail. All of this with a stable sync rate of 8mbps and an IP Profile of 7000.
Has anyone had similar issues and had a fix? If so any advice in what we need to do or say to get a break?
Thank you for any help you can offer and I apologise for the wall of text
Cheers,
Liam

Answer 1

this certainly looks like many posts on here recently and is normally a problem at the exchange.
However as you are not a BT broadband customer there is nothing that the mods on this forum can do to help.  This forum is BT retail and is an ISP just like Plusnet.  The only people who are going to be able to help get your exchange sorted is your own ISP
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