Sometimes it's not the user/customer who's wrong.
Phone and internet became intermittent one afternoon. During an interval when the phone was working ask BT helldesk is there's work going on in the area.
There isn't. We can send out an engineer, £80 charge if it's not our fault.
Offer declined, walk down to the village where the footway cabinet is located to find:
2 x OpenReach vans
2 x manholes opened
2 x OpenReach bods occupying manholes, redoing everyone's connections.