My Abarth revs really fast when I put it I. Reverse W/O using gas anyone ? Same

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My Abarth when I put it into reverse it wants to just take off the min I start to let off the clutch ... The dealer says "it's a common concern" key word concern!? Refuse to aknoledge it .. I was just moving it in my garage .. And the door was closed and I had to slam on the breaks ! It just goes when you let off the clutch ? It doesn't even stall? What is this ? Ask the sunroofs are misaligned and leak and pool with water right where the moulding is.. The sunroofs are warped or the tracks !? Getting the whole thing replace brand new car ? And they're tearing out the headliner not happy :( only 600 miles and now having to click the transmission ? Anyone have these problems ?