What happened to me relates to meters, rather than smart meters, but I do still think about it. A couple of years ago I had a letter from E.ON, my supplier, telling me that as I'd refused entry to their engineer on two occasions, if necessary I would be forced by police/Court to allow entry. I rang them to let them know that nobody had called, nor left a card, and I didn't like being threatened. Apparently I was mistaken, at least according to them, and the engineer had left a card both times he'd called. I arranged with them for the engineer to visit one day the following week between 7.30 and 11.00 to change the meter. Of course, nobody showed up, and I rang them, and was told that the engineer HAD called, and been refused admittance by a man. I pointed out that I am a woman and lived on my own. Another appointment was made, and again nobody arrived, and when I called, I was told that the work had been done as the meters are outside my house. I told them that they most certainly are not, they are under the stairs. However, no amount of talking to them would persuade them that their engineer was clearly going to the wrong house (although the letter they'd sent proved they had the correct address and post code), and I was told that as far as they were concerned, the work had been done. (And of course, if the meters really were outside, why hadn't the engineer done the work on his first 'visit'?)
As soon as I was out of contract, I moved to First Utility.