As Mannyo says if its that deep and cut through the gel coat then its going to be impossible to polish it out. Sorry. Feel gutted for you.  I suggest you go to a bodyshop and get their advice too.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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