It is hard to see from the photo whether that is black marks on top of your paint, or all of the paint and primer have been removed and it is black plastic showing through. (You will feel the difference, or if you really cannot tell then swing by and we can take a look)
If it is black marks on top of the paint , try a clay bar and if neccessary after a light polish to remove.
If the paint is gone and you can feel black plastic, take it to the body/panel shop and get them to add the paint back! If you are not looking for a perfect finish get some 'batch matched' touch up (paint code on the door surround or bonnet) and gently touch in - at least it will be white again and not black...
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