Hi nailit
In answer to your first question, I would imagine that they didn't either know or do their homework on where exactly your flat was...and if, say for instance, on three or four levels, it might be possible to fit them. High rise properties obviously are a techno problem, which brings us to your second question and I don't have a Scooby, mate.....it must be, annoyingly, a work in progress.
On Smart Meters, I refuse to have one until they sort out the many faults reported pretty much in most medias and feedback through family and friends, who have had countless problems with them.
I was only talking to my supplier just before Christmas, getting a fixed rate tariff up to 2020, and asked for them to check out my normal meter which has been there for 15 years, to see if I need an upgrade and change it like for like, as I informed them I do not want a smart meter fitted....they said no problem, they sent someone to have a look...all running fine and dandy, so no need to replace.
Hope you're well, nailit....(I'm watching Chelsea vs Norwich City in the FA Cup whilst multi-tasking) :-)