Actually I've had four "engineers", two on each occasion.
On 11/04/16 I had one that didn't have a clue and all he did was "telephone stuff", the other did nothing other than keep his hands in his pockets except to puff on his electronic cigarette.
On 21/04/16 I had another turn up who did "telephone stuff" with faulty test equipment, he called his mate to come over, another "telephone stuff" guy. They proceeded to take readings all over the place with said faulty equipment, surprisingly getting no useable information, they then swapped me onto another pair and buggered off without testing it or waiting for me to see if it was better or worse. They did say they would be back, then an hour later phoned me and after me telling them it was far worse told me they would not be returning!
Busted flushes the lot of them.