Frustrated57,
I wish you the best of luck! It might not be as apparent as you think. Depending on where your cables run from the exchange and your cabinet and your cabinet and your home, it might be because of waterlogging (like in my case - apparently, my link was 'submerged') or wind and active rain.
Provided that you're confident in everything you've done within the house, I'd have no issues with getting on the phone to BT and have them send an Openreach chap out again. Eventually, you'll get a good'un who doesn't mind tracing the fault back to the exchange.
Even earn some brownie points - if you go out and check your telegraph pole, see if it is within its inspection date so that Openreach know if a cherry picker is required... whether BT relay that information is another thing!
I've been here before, Frustrated57; persevere!