well goodness me girl why didnt you say this before???
of course this is unacceptable, poor little one is probably bored stiff..
my littlies(both asleep now I hasten to add so having a stolen moment in between paperwork)
on a typical week we will do painting, model making, toddler group, library, soft play/park/ garden /depending on the weather, gardning, feeding ducks, birds, gluing, toy library, dressing up, cooking and always always story time...
they come here( and go home) happy, interested and usually knackered.
daily diary every day, reward stars and fruit bags to go home with.
please dont think all cms are like this, were they ever registered??
move him of course, as for left alone I cant understand why you didnt act then tbh.
good luck with new child care and set your standard for it a bit higher..