:( Not good as the saying goes. I've think you been done up like a kipper << (Not sure how that saying came about either ;) )
Like my over priced bill that also failed and cost me more money but not as much as you, I'd look at it as a lesson learned :( a costly one.
A young lady Surgeon I know text me yesterday she had been quoted £785 to fit a windscreen motor for her CRV and that's from a garage that people talk about and is highly recommend. Not sure how they couldn't find a MAF fault and a split pipe when I took my car there. Since then I spoke to a guy who now works for a mate of mine who I use now without fail, even let's me use his ramps if one is free at weekends if I need it :D He told me while he was doing his apprenticeship they sometimes didn't even do tests on the cars that they said they did. Just drive it down the road pull in the garage and look for other fault's and not even test anything, but still charge for it. So you're not on your own just annoying and bad for the good garages out there when this happens :( Think it's made worse as someone recommended them to you, I hope they sort you out with free drinks and a meal :D I'd make them wash the car too ;)