Noooooo Way.
You mean BT could possibly be talking [censored] ????
Im not surprised by you saying they can't test it remotely, that would explain the Engineer saying she couldn't find anything wrong.
Bear in mind this was supposedly the higher level BT Tech guy, even after reminding him the line was tested in the house and found to be fine by the Engineer.
I have no clue as you probably noticed lol, but I did find it crazy BT was contradicting the Engineer.
But Im just a lowly punter, so have to let them do as they please.
At least its their money, not mine down the pan!
Cheers