That sucks.My smart meter replacement that was due today (12-4pm) has just been cancelled. That's twice so far that AES have cancelled an appointment on me with a couple of hours notice.
Now rebooked for Thursday.
Are the cancellations related to Covid restrictions? In Scotland I'm not sure they can do smart meter installations at the moment as tradesmen are only allowed inside for safety related matters. My neighbour installs smart meters and his van hasn't moved since the start of the year.