scooter boy
Hi, I just did a 500 hour / annual on a 4 year old R-44 a couple of months ago and including mag overhaul and parts & labour and a couple of AWDs cost around $4,600.00 CAN . I have over 20 years time on Robinsons Helicopters however I no longer work on them as often as I used to, but continue to to keep myself current on piston aircraft. I only deal with a few select customers that are willing to pay for a proper inspections and never balk at the price of good maintenance.
But in your case it sounds like you got taken to the cleaners, ask for a detailed explanation of what was done and if your still not satisfied seek out another more reputable AMO.