Look at it positively... the OP had a chance to try the 'slammed' suspension feel for a few miles, without the underside of the car hitting the ground.
Obviously a big mistake at the garage, probably very red faced, done their part to ensure it is all OK... let's remember we are all human.
Of course we don't expect it, but mistakes do happen. Plus as I said before, the car is under warranty and this incident has been logged, so I say just go out and enjoy.
HighlandPete