Exactly the same situation
I have BT internet service as a customer in Nottingham with daily outages at the Hub.
The BT complaints process is a joke. 3 times they've sent Openreach engineer out only for them to say that I need BT cable lines to be replaced, for them to record this on their system and put a note on the pole, yet it takes a different part of BT openreach has to fix it!
The kicker is NO-ONE in BT complaints has any record of this on the incident ticket despite 3 visits and BT themselves having pinned a note to the post.
BT are a cluster-fucking omnishambles.