Who cares what type of loaner you get? I mean be glad you can get one at all. Most car dealers dont even offer it.
You guys are concerned with all the wrong things.
Id be worried about the work and the quality or lack there of -
not their scheduling and loaner car availability.
As far as op .. Id be pissed too since you made an appt. for one and they dropped the ball.
Personally I'd say they played you for a fool cause there are Always loaner cars available.
Its your service advisor thats jerking you.