I'd make a constructive complaint via PALS.
If they were going to get a chair/trolley, that doesn't take three people and a clear 'wait there don't move we'll be back' would have been given even if it HAD required the whole crew to fetch it.
I have done this (once, in all the times I have had to call an ambulance, which with a dodgy ticker and lots of co-morbidities, is a fair bit)...
In my case, a paramedic took it upon himself to berate me, at length, for not taking a medication regularly that he had decided I ought to take daily, and had mistaken what that medication was.
So there I am, in severe pain (gallstones), naked in bed with a strange man in my room shouting at me, because he thinks I've not been taking a steroid I should have every day.
In fact he'd mistaken a diuretic I am to take 'as and when' (How I do not know and I am not on any steroids!) which I of course have not been taking every day as I only need to take it occasionally.
He was pretty dismissive and unpleasant, which got worse when I refused the gas and air (makes me spew, particularly when already feeling rough, particularly when travelling backwards in a fucking ambulance) - he kept making nasty comments about people not taking medication being a drain on the NHS! I had the gas and air, threw up (all the medication I'd swallowed half an hour ago when it was due) and this displeased him even more!
PALS took it to the ambulance lot who sent a decent letter of apology and told me more training had been given. Such an event has never happened since!