If the body shop didn’t remove the front bumper when they repainted the damaged area, it’s possible that they may have blended the new paintwork on the bumper into the wing and then machine polished the bumper and wing. That would explain why you’ve got buffer trails (rather than swirls) on the paintwork on the wing.
Although I’ve not tried it, it should be possible to remove paint overspray by claying the affected area(s). There’s lots of videos on YouTube to show how this works. Claying might inflict some marring to the paintwork if insufficient lubricant is used, especially if a heavy grade clay bar is (or needs to be) used to remove paint overspray. However, marring can be removed by machine polishing, using an appropriate combination of polish and pad - a good professional detailer should be able to rectify your paintwork issues without any problems; but at a cost, and you shouldn’t have to bear the cost of putting right the damage the body shop has caused.
Please keep us posted on how this develops.