The clutch should turn freely (by hand) right? It only gets engaged when you flip the switch right?
John is correct, but there is some confusion going on in terminology in the initial question.
The initial question seemed to equate the pulley with the clutch. They operate independently unless the switch is flipped.
The clutch acts like...a clutch. It is always connected to the compressor; not always connected to the pulley.
I cannot imagine a shop would mess this procedure up....okay, I CAN imagine that. But they would really have to have their head up their XXX.
Do as John said and remove the belt. The pulley should freely rotate. Not the clutch. Turn on the AC switch - no need to have the engine running. Do make sure the clutch wire is feeding 12 volts. Now pulley is locked to clutch and to the compressor shaft and should not freely turn.
Get back to us on this once you have checked things out.