Your post was moved by a Moderator, no doubt because he thought you'd stand a better chance of getting more informed help on this board, but also it can confuse a situation when you post in someone else's thread. Moderators do not kowtow to Plusnet, they are independent.
And your connection to Be will still be over the same dodgey cable pair to the exchange that you are on now. At the end of the day I wonder if they will put the same effort into getting you problem sorted as Plusnet will. You are obviously some distance from the exchange judging by the limited information you've posted and whichever ISP you are with they have the same systems for communicating with and fault reporting to BTWholesale and/or Openreach so delays and etc. will be the same.
You may be a Network engineer but you clearly don't understand how BTWholesale and Openreach work. I'm not defending them, I think they are both badly managed organisations. They don't tell any ISP/CP when they are doing general maintenance on any of their customers circuits or lines - they don't even tell the customers who suddenly`find they are without a service because they are replacing a cable when they know exactly who is going to be affected and couldn't be bothered to call them and tell them they'd be without service for several hours.
That all said, it depends on who who pay your line rental to. If it's BT and not Plusnet, well you'll need to be talking to Mumbai. Bad luck because based on the limited information you've posted it sounds like you have a line fault that need to be reported as a phone fault.
Can you hear noise on the line when making a call If so, next time the noise is present, plug a known good corded phone direct into the test socket and confirm the noise is present. Phone and report it whilst the noise is present and try and do so before there is an incoming call - ringing current can sometimes "clean" a bad connection and the noise disappears for a period. Tell the Call taker that you are plugged into the test socket with a known good corded phone. Don't mention the broadband otherwise you may get given the run around. Get the call taker to confirm they can hear the noise, request them to log that fact and the fact that is intermittent. Request that that detail is passed to the Openreach engineer. These requests are important to make sure you don't get a No fault found bill if an engineer can't find a fault, but if the enginner is aware it's intermittent they should know a few things to check if they are any good.
I wouldn't guess you are necessarily going to get your problem fixed very quickly. Judging by the number of BT vans you said were in the area, unless they were installing FTTC, they obviously have some major cable problems that could take time to sort. None of that is Plusnet's fault - they are in the hands of BT Openreach as would be any provider. There's no point in asking you to post any ADSL stat's as you are such an expert you can probably diagnose the issues yourself and see what sort of speeds you should be able to achieve if/when your line is fixed.
