Well, now, Hypnocracy, that's got to be aggravating -
I reckon you don't have any viable options except to let them finish the job and get your car back in running order.
On the brighter side, it's wintertime, so let the loaner car be your winter beater for a spell. Not much fun driving an FR-S on cold, wet, slick roads anyway.
I would imagine they want to get your car back to you just as bad as you want it back.
Now, where did I put that serenity prayer??
humfrz